Added FIXME comments
Fixed TaskScheduler leak
Minor changes to math module

-Fixed missing Set method: "X::Set(const X&)"
-Removed operator String
Removed useless braces
Fixed ShaderBuilder bug

Fixed: When GLSL 140 is supported and MRT is not (As reported by
Renderer), then the ShaderBuilder will write incorrect code
Moved AxisAlignedBox::GetCorner to Cube
Updated OpenGL headers