Implemented Nukkit MessageBuilder

- Added CMDSender#supportsChatEvents because Nukkit players don't support
  hover or click events. This means that isPlayer method is not sufficient
  for finding out if the sender can produce these events.

Plan/bukkit/src/main/java/com/djrapitops/plan/commands/use/BukkitPlayerCMDSender.java

@@ -49,4 +49,9 @@ public class BukkitPlayerCMDSender extends BukkitCMDSender {
     public ChatFormatter getFormatter() {
         return new PlayerChatFormatter();
     }
+
+    @Override
+    public boolean supportsChatEvents() {
+        return true;
+    }
 }

Plan/bungeecord/src/main/java/com/djrapitops/plan/command/use/BungeePlayerCMDSender.java

@@ -48,5 +48,8 @@ public class BungeePlayerCMDSender extends BungeeCMDSender {
         return new PlayerChatFormatter();
     }
 
-
+    @Override
+    public boolean supportsChatEvents() {
+        return true;
+    }
 }

Plan/common/src/main/java/com/djrapitops/plan/commands/subcommands/DatabaseCommands.java

@@ -167,7 +167,7 @@ public class DatabaseCommands {
 
         if (toDB.getState() != Database.State.OPEN) toDB.init();
 
-        if (sender.isPlayer()) {
+        if (sender.supportsChatEvents()) {
             sender.buildMessage()
                     .addPart(colors.getMainColor() + "You are about to overwrite data in Plan " + toDB.getType().getName() + " with data in " + backupDBFile.toPath()).newLine()
                     .addPart("Confirm: ").addPart("§2§l[\u2714]").command("/" + mainCommand + " accept")
@@ -219,7 +219,7 @@ public class DatabaseCommands {
             throw new IllegalArgumentException(locale.getString(ManageLang.FAIL_SAME_DB));
         }
 
-        if (sender.isPlayer()) {
+        if (sender.supportsChatEvents()) {
             sender.buildMessage()
                     .addPart(colors.getMainColor() + "You are about to overwrite data in Plan " + toDB.getName() + " with data in " + fromDB.getName()).newLine()
                     .addPart("Confirm: ").addPart("§2§l[\u2714]").command("/" + mainCommand + " accept")
@@ -274,7 +274,7 @@ public class DatabaseCommands {
         DBType fromDB = arguments.get(0).flatMap(DBType::getForName)
                 .orElseThrow(() -> new IllegalArgumentException(locale.getString(ManageLang.FAIL_INCORRECT_DB, arguments.get(0).orElse("<MySQL/SQLite/H2>"))));
 
-        if (sender.isPlayer()) {
+        if (sender.supportsChatEvents()) {
             sender.buildMessage()
                     .addPart(colors.getMainColor() + "You are about to remove all Plan-data in " + fromDB.getName()).newLine()
                     .addPart("Confirm: ").addPart("§2§l[\u2714]").command("/" + mainCommand + " accept")
@@ -331,7 +331,7 @@ public class DatabaseCommands {
 
         Database database = dbSystem.getDatabase();
 
-        if (sender.isPlayer()) {
+        if (sender.supportsChatEvents()) {
             sender.buildMessage()
                     .addPart(colors.getMainColor() + "You are about to remove data of " + playerUUID + " from " + database.getType().getName()).newLine()
                     .addPart("Confirm: ").addPart("§2§l[\u2714]").command("/" + mainCommand + " accept")

Plan/common/src/main/java/com/djrapitops/plan/commands/subcommands/LinkCommands.java

@@ -77,7 +77,7 @@ public class LinkCommands {
     }
 
     MessageBuilder linkTo(MessageBuilder builder, CMDSender sender, String address) {
-        if (sender.isPlayer()) {
+        if (sender.supportsChatEvents()) {
             builder.addPart(colors.getTertiaryColor() + "§l[Link]").link(address).hover(address);
         } else {
             builder.addPart(colors.getTertiaryColor() + address);

Plan/common/src/main/java/com/djrapitops/plan/commands/subcommands/RegistrationCommands.java

@@ -197,7 +197,7 @@ public class RegistrationCommands {
             throw new IllegalArgumentException(locale.getString(CommandLang.USER_NOT_LINKED));
         }
 
-        if (sender.isPlayer()) {
+        if (sender.supportsChatEvents()) {
             sender.buildMessage()
                     .addPart(colors.getMainColor() + "You are about to unregister '" + presentUser.getUsername() + "' linked to " + presentUser.getLinkedTo()).newLine()
                     .addPart("Confirm: ").addPart("§2§l[\u2714]").command("/" + mainCommand + " accept")

Plan/common/src/main/java/com/djrapitops/plan/commands/use/CMDSender.java

@@ -44,6 +44,10 @@ public interface CMDSender {
         return getPlayerName().isPresent();
     }
 
+    default boolean supportsChatEvents() {
+        return false;
+    }
+
     Optional<UUID> getUUID();
 
     void send(String message);

Plan/nukkit/src/main/java/com/djrapitops/plan/commands/use/NukkitMessageBuilder.java

@@ -0,0 +1,87 @@
+/*
+ *  This file is part of Player Analytics (Plan).
+ *
+ *  Plan is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU Lesser General Public License v3 as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  Plan is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU Lesser General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Lesser General Public License
+ *  along with Plan. If not, see <https://www.gnu.org/licenses/>.
+ */
+package com.djrapitops.plan.commands.use;
+
+import java.util.Collection;
+
+public class NukkitMessageBuilder implements MessageBuilder {
+
+    private final NukkitCMDSender sender;
+    private final StringBuilder builder;
+
+    public NukkitMessageBuilder(NukkitCMDSender sender) {
+        this.sender = sender;
+        builder = new StringBuilder();
+    }
+
+    @Override
+    public MessageBuilder addPart(String part) {
+        builder.append(part);
+        return this;
+    }
+
+    @Override
+    public MessageBuilder newLine() {
+        builder.append("\n");
+        return this;
+    }
+
+    @Override
+    public MessageBuilder link(String link) {
+        addPart(link);
+        return this;
+    }
+
+    @Override
+    public MessageBuilder command(String s) {
+        return this;
+    }
+
+    @Override
+    public MessageBuilder hover(String s) {
+        return this;
+    }
+
+    @Override
+    public MessageBuilder hover(String... strings) {
+        return this;
+    }
+
+    @Override
+    public MessageBuilder hover(Collection<String> collection) {
+        return this;
+    }
+
+    @Override
+    public MessageBuilder indent(int amount) {
+        for (int i = 0; i < amount; i++) {
+            builder.append(' ');
+        }
+        return this;
+    }
+
+    @Override
+    public MessageBuilder tabular(CharSequence charSequence) {
+        addPart(sender.getFormatter().table(charSequence.toString(), ":"));
+        return this;
+    }
+
+    @Override
+    public void send() {
+        sender.sender.sendMessage(builder.toString());
+    }
+}

Plan/sponge/src/main/java/com/djrapitops/plan/commands/use/SpongePlayerCMDSender.java

@@ -45,4 +45,9 @@ public class SpongePlayerCMDSender extends SpongeCMDSender {
     public ChatFormatter getFormatter() {
         return new PlayerChatFormatter();
     }
+
+    @Override
+    public boolean supportsChatEvents() {
+        return true;
+    }
 }

Plan/velocity/src/main/java/com/djrapitops/plan/commands/use/VelocityCMDSender.java

@@ -32,7 +32,7 @@ public class VelocityCMDSender implements CMDSender {
 
     @Override
     public MessageBuilder buildMessage() {
-        return null; /*TODO*/
+        return new VelocityMessageBuilder(this);
     }
 
     @Override

Plan/velocity/src/main/java/com/djrapitops/plan/commands/use/VelocityPlayerCMDSender.java

@@ -45,4 +45,9 @@ public class VelocityPlayerCMDSender extends VelocityCMDSender {
     public ChatFormatter getFormatter() {
         return new PlayerChatFormatter();
     }
+
+    @Override
+    public boolean supportsChatEvents() {
+        return true;
+    }
 }