Person8880/Shine — pull request #402 by Person8880 (2014-10-26 20:23:04+00:00)
Title: Fix duplicate entries in all plugins list

Also:
- Fixed plugins that error in their cleanup function not actually being disabled and causing varying degrees of havoc.
- Tweaked the look of window close buttons so they look less out of place.
- Added some validity checks to some SGUI controls to make sure they're dealing with valid objects.