Added events to the logical tree view, fixed minor UI problems elsewhere
Made tool windows closable via the "X" in the top corner
Show entity type and targetname in the status bar
Add more options to disable various transparency-related features
Implemented 'hide face mask' in the OpenGL1 renderers
Implemented "used textures only" in the texture browser. Fixes #38.
Prevent the steam game selector interfering with a WON game configuration
Started implementing adding/removing of keys in the entity editor