Added permission checks for tools on /use/, so now if you switch world or lose your permissions, you lose your tools.

src/main/java/com/sk89q/worldedit/LocalSession.java

@@ -455,7 +455,7 @@ public class LocalSession {
         Tool tool = getTool(item);
         
         if (tool == null || !(tool instanceof BrushTool)) {
-            tool = new BrushTool();
+            tool = new BrushTool("worldedit.brush.sphere");
             setTool(item, tool);
         }