changelog
    
    
    - Tue, 14 May 2013 18:32:34 +0300
 
    - by Santeri Piippo <crimsondusk64@gmail.com> [Tue, 14 May 2013 18:32:34 +0300] rev 203
 
    - Added Coverer interface
 
    - Tue, 14 May 2013 18:00:50 +0300
 
    - by Santeri Piippo <crimsondusk64@gmail.com> [Tue, 14 May 2013 18:00:50 +0300] rev 202
 
    - Un-templated CheckBoxGroup, moved it and RadioButton into widgets.cpp/widgets.h; removed license text tab because I think LICENSE is enough.
 
    - Tue, 14 May 2013 04:17:43 +0300
 
    - by Santeri Piippo <crimsondusk64@gmail.com> [Tue, 14 May 2013 04:17:43 +0300] rev 201
 
    - Added icons for wireframe and inversion