Adds GameModeAddon method that is called when BentoBox loads all addons.

Required to fix https://github.com/BentoBoxWorld/BentoBox/issues/940

src/main/java/world/bentobox/bentobox/BentoBox.java

@@ -215,15 +215,17 @@ public class BentoBox extends JavaPlugin {
                     TextVariables.VERSION, instance.getDescription().getVersion(),
                     "[time]", String.valueOf(loadTime + enableTime));
 
-            // Fire plugin ready event - this should go last after everything else
+            // Tell all addons that everything is loaded
             isLoaded = true;
+            this.addonsManager.allLoaded();
+            // Fire plugin ready event - this should go last after everything else
             Bukkit.getServer().getPluginManager().callEvent(new BentoBoxReadyEvent());
 
             if (getSettings().getDatabaseType().equals(DatabaseSetup.DatabaseType.YAML)) {
                 logWarning("*** You're still using YAML database ! ***");
                 logWarning("This database type is being deprecated from BentoBox as some official addons encountered difficulties supporting it correctly.");
                 logWarning("You should switch ASAP to an alternative database type. Please refer to the comments in BentoBox's config.yml.");
-                logWarning("There is NO warranty YAML database will remain properly supported in the following updates, and its usage should as such be considered a non-viable situation.");
+                logWarning("There is NO guarantee YAML database will remain properly supported in the following updates, and its usage should as such be considered a non-viable situation.");
                 logWarning("*** *** *** *** *** *** *** *** *** *** ***");
             }
         });

src/main/java/world/bentobox/bentobox/api/addons/Addon.java

@@ -418,4 +418,10 @@ public abstract class Addon {
     public boolean registerFlag(Flag flag) {
         return getPlugin().getFlagsManager().registerFlag(this, flag);
     }
+
+    /**
+     * Called when all addons have been loaded by BentoBox
+     * @since 1.8.0
+     */
+    public void allLoaded() {}
 }

src/main/java/world/bentobox/bentobox/api/user/User.java

@@ -293,7 +293,7 @@ public class User {
     public int getPermissionValue(String permissionPrefix, int defaultValue) {
         // If requester is console, then return the default value
         if (!isPlayer()) return defaultValue;
-        
+
         int value = defaultValue;
 
         // If there is a dot at the end of the permissionPrefix, remove it

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

@@ -445,4 +445,12 @@ public class AddonsManager {
                 .collect(Collectors.toList());
     }
 
+    /**
+     * Notifies all addons that BentoBox has loaded all addons
+     * @since 1.8.0
+     */
+    public void allLoaded() {
+        addons.forEach(Addon::allLoaded);
+    }
+
 }