More API improvements

plugin/src/main/java/org/battleplugins/arena/competition/CompetitionManager.java

@@ -181,7 +181,7 @@ public void removeCompetition(Arena arena, Competition<?> competition) {
                 }
             }
 
-            liveCompetition.onDestroy();
+            liveCompetition.destroy();
         }
 
         competitions.remove(competition);

plugin/src/main/java/org/battleplugins/arena/competition/LiveCompetition.java

@@ -306,7 +306,11 @@ public final <E extends org.battleplugins.arena.options.ArenaOption> E getOption
         return this.arena.getOption(type);
     }
 
-    protected final void onDestroy() {
+    protected final void destroy() {
+        this.onDestroy();
+    }
+
+    protected void onDestroy() {
         this.arena.getEventManager().unregisterEvents(this.competitionListener);
         this.arena.getEventManager().unregisterEvents(this.optionsListener);
         this.arena.getEventManager().unregisterEvents(this.statListener);

plugin/src/main/java/org/battleplugins/arena/competition/map/options/Bounds.java

@@ -70,6 +70,22 @@ public int getMaxZ() {
         return this.maxZ;
     }
 
+    public int getWidth() {
+        return this.maxX - this.minX;
+    }
+
+    public int getHeight() {
+        return this.maxY - this.minY;
+    }
+
+    public int getLength() {
+        return this.maxZ - this.minZ;
+    }
+
+    public int getVolume() {
+        return this.getWidth() * this.getHeight() * this.getLength();
+    }
+
     public boolean isInside(Bounds bounds) {
         return this.isInside(bounds.getMinX(), bounds.getMinY(), bounds.getMinZ()) && this.isInside(bounds.getMaxX(), bounds.getMaxY(), bounds.getMaxZ());
     }