Add NotImplementedException and OpenGLException
Add GPUHelper and MathHelper classes
Changed Surface and Frame interface
Implement non-GLSL parts of the Histogram class family
Implementation UIntegerInterval, incomplete
Merge branch 'master' of https://github.com/V02460/CTT
Merge branch 'master'
Fixes some mistakes in UIntegerInterval (still not valid) and makes FrameTest compilable again.