Add flight game rule

src/main/java/de/erethon/dungeonsxl/game/GameRuleProvider.java

@@ -50,6 +50,7 @@ public class GameRuleProvider {
 
         /* World */
         DEFAULT_VALUES.gameMode = GameMode.SURVIVAL;
+        DEFAULT_VALUES.fly = false;
         DEFAULT_VALUES.breakBlocks = false;
         DEFAULT_VALUES.breakPlacedBlocks = false;
         DEFAULT_VALUES.breakWhitelist = null;
@@ -115,6 +116,7 @@ public class GameRuleProvider {
 
     /* World */
     protected GameMode gameMode;
+    protected Boolean fly;
     protected Boolean breakBlocks;
     protected Boolean breakPlacedBlocks;
     protected Map<ExItem, HashSet<ExItem>> breakWhitelist;
@@ -212,6 +214,10 @@ public class GameRuleProvider {
         return gameMode;
     }
 
+    public boolean canFly() {
+        return fly;
+    }
+
     /**
      * @return if all blocks may be destroyed
      */
@@ -684,6 +690,10 @@ public class GameRuleProvider {
             gameMode = defaultValues.gameMode;
         }
 
+        if (fly == null) {
+            fly = defaultValues.fly;
+        }
+
         if (breakBlocks == null) {
             breakBlocks = defaultValues.breakBlocks;
         }

src/main/java/de/erethon/dungeonsxl/player/DGamePlayer.java

@@ -96,6 +96,7 @@ public class DGamePlayer extends DInstancePlayer {
         if (!rules.getKeepInventoryOnEnter()) {
             clearPlayerData();
         }
+        player.setAllowFlight(rules.canFly());
 
         if (rules.isLobbyDisabled()) {
             ready();

src/main/java/de/erethon/dungeonsxl/player/DInstancePlayer.java

@@ -69,6 +69,8 @@ public abstract class DInstancePlayer extends DGlobalPlayer {
     /* Actions */
     /**
      * Clear the player's inventory, potion effects etc.
+     * <p>
+     * Does NOT handle flight.
      */
     public void clearPlayerData() {
         player.getInventory().clear();
@@ -85,7 +87,6 @@ public abstract class DInstancePlayer extends DGlobalPlayer {
             player.setCollidable(true);
             player.setInvulnerable(false);
         }
-        player.setAllowFlight(false);
     }
 
     /**

src/main/java/de/erethon/dungeonsxl/world/WorldConfig.java

@@ -143,6 +143,10 @@ public class WorldConfig extends GameRuleProvider {
             }
         }
 
+        if (configFile.contains("fly")) {
+            fly = configFile.getBoolean("fly");
+        }
+
         if (configFile.contains("breakBlocks")) {
             breakBlocks = configFile.getBoolean("breakBlocks");
         }