[Editor] No mouse interface for editing actors

```
What steps will reproduce the problem?
1. Launch the editor
2. Load a world file
3. Notice how you can't drag an actor

What is the expected output? What do you see instead?
- You should be able to drag an actor to change its transform and do other nice 
mouse things with the editor.

```

Original issue reported on code.google.com by `rezinat...@gmail.com` on 18 Mar 2012 at 10:41
