[Transition] Fix missing begin/endResetModel from Pre-Port
[Transition] Remove GLee, switch to QOpenGL classes **NOW USING QT5**
[Transition] Remove GLee source and header files
[Transition] Strip Qt 4-specific code branches

The codebase can no longer compile on Qt 4 after the OpenGL transition.
So, remove all the version checks.
[Transition] Remove .pro/.pri code that only Qt4 needed