You can now hide particular layers of the map.
Fixed a couple of minor issues on the LevelCanvas.
Started the process of recreating the editor in FLUID. Laying out the
GUI by hand became too cumbersome.
The old editor's code is still available in editor.old.cpp
Most of the tileset related functionality is now ported into the new version of the editor.
Several changes to improve the GUI.
"Visible" buttons for the layers