Moved annotation package to internal package.

Closes WORLDEDIT-3055.

src/main/java/com/sk89q/worldedit/internal/annotation/RequiresNewerGuava.java

@@ -17,7 +17,7 @@
  * along with this program. If not, see <http://www.gnu.org/licenses/>.
  */
 
-package com.sk89q.worldedit.util.annotation;
+package com.sk89q.worldedit.internal.annotation;
 
 import java.lang.annotation.Documented;
 import java.lang.annotation.Retention;

src/main/java/com/sk89q/worldedit/util/eventbus/EventBus.java

@@ -24,7 +24,7 @@ import com.google.common.collect.Multimap;
 import com.google.common.collect.Multimaps;
 import com.google.common.collect.SetMultimap;
 import com.google.common.eventbus.DeadEvent;
-import com.sk89q.worldedit.util.annotation.RequiresNewerGuava;
+import com.sk89q.worldedit.internal.annotation.RequiresNewerGuava;
 
 import java.lang.reflect.InvocationTargetException;
 import java.util.*;

src/main/java/com/sk89q/worldedit/util/eventbus/HierarchyCache.java

@@ -21,7 +21,7 @@ package com.sk89q.worldedit.util.eventbus;
 
 import com.google.common.collect.Lists;
 import com.google.common.collect.Sets;
-import com.sk89q.worldedit.util.annotation.RequiresNewerGuava;
+import com.sk89q.worldedit.internal.annotation.RequiresNewerGuava;
 
 import java.util.*;