[Editor] Memory Leaks in the editor

```
What steps will reproduce the problem?
1. Launch the editor
2. Load a world file
3. Quit the editor
4. Observe the memory leaks

What is the expected output? What do you see instead?
- There should be no memory leaks.

```

Original issue reported on code.google.com by `rezinat...@gmail.com` on 18 Mar 2012 at 10:58
