Implemented basic Hooks API

WIP

src/main/java/world/bentobox/bentobox/api/hooks/BaseHook.java

@@ -0,0 +1,26 @@
+package world.bentobox.bentobox.api.hooks;
+
+import org.bukkit.Bukkit;
+import org.bukkit.plugin.Plugin;
+
+/**
+ * @author Poslovitch
+ */
+public abstract class BaseHook implements Hook {
+
+    private String pluginName;
+
+    public BaseHook(String pluginName) {
+        this.pluginName = pluginName;
+    }
+
+    @Override
+    public Plugin getPlugin() {
+        return Bukkit.getPluginManager().getPlugin(pluginName);
+    }
+
+    @Override
+    public boolean isPluginAvailable() {
+        return getPlugin() != null && getPlugin().isEnabled();
+    }
+}

src/main/java/world/bentobox/bentobox/api/hooks/Hook.java

@@ -0,0 +1,27 @@
+package world.bentobox.bentobox.api.hooks;
+
+import org.bukkit.plugin.Plugin;
+
+/**
+ * @author Poslovitch
+ */
+public interface Hook {
+
+    /**
+     * Returns the Plugin instance related to this Hook or null if it could not be found.
+     * @return the Plugin instance of the plugin this Hook hooks into.
+     */
+    Plugin getPlugin();
+
+    /**
+     * Returns whether the plugin is available or not.
+     * @return true if the plugin is available, false otherwise.
+     */
+    boolean isPluginAvailable();
+
+    /**
+     * Tries to hook into the plugin and returns whether it succeeded or not.
+     * @return true if it successfully hooked into the plugin, false otherwise.
+     */
+    boolean hook();
+}

src/main/java/world/bentobox/bentobox/managers/HooksManager.java

@@ -0,0 +1,17 @@
+package world.bentobox.bentobox.managers;
+
+import world.bentobox.bentobox.api.hooks.Hook;
+
+import java.util.List;
+
+/**
+ * @author Poslovitch
+ */
+public class HooksManager {
+
+    private List<Hook> hooks;
+
+    public List<Hook> getHooks() {
+        return hooks;
+    }
+}