replaced aliased OpenGLExtension calls

Merged Martin Schultz requested to merge featureRemoveExtensions into master

replaced glCalls which used Extensions, that are aliased following OpenGL Specification.

relates to and

I used a small powershell script to parse the OpenGL Spec gl.xml The script consists of less than 30 Lines of Code, and downloads the spec from github and deletes it afterwards. I also challenged @kschuster to do the same using python. Excited to see his results.

You judge who wins by merging the respective MR

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