OpenGL 3 implementation of glfontstash.h#23

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BastiaanOlij wants to merge 5 commits intomemononen:masterfrom

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Commits on Nov 22, 2014

Commits on Dec 24, 2014

Moved all the OpenGL 3 changes into a separate implementation called gl3fontstash.h
BastiaanOlij
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Added info about using OpenGL 3 support.
BastiaanOlij
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Commits on Jan 23, 2016

Small changes to make C compiler on windows happy
BastiaanOlij
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