+ Added a working renderer, woo!

N The renderer is quite chatty for now, since it's still in the works
F Lots of fixed to Map API
+ Added EyDataStream (inherits QDataStream, LittleEndian byte order by default)
+ Added RenderableMapTerrain
F Fixed OverlayDescriptor constructor
F "Group" tag of OverlayDescriptor is now hidden
+ Added EMEOverlaysWidget
F OpenGLWindow requests OpenGL 3.3 now