Removed static contexts from the opengl object. In future, this has to be...
Removed static contexts from the opengl object. In future, this has to be handled by our opengl wrapper, which will hold a copy of the gl state on cpu side. Made all opengl contexts not copyable. Created a macro for the shared typedefs which directly creates a const version of the pointer. Started to change some opengl object functions to be non-const although they might not change any class members, because the function still might change something on gpu side. Therfore, returning the context of any opengl object is also non-const now! Changed the renderbuffer constructor to just create the context and moved the rest to its corresponding controller. Removed own type enums in opengl objects => ONLY use the orginial GLenums here!
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