Add support for externally provided GL3 #110
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librw supports OpenGL3 but only when the windows & OpenGL context creation is handled by GLFW or SDL2.
This commit adds a new "extgl3" GfxLib for the OpenGL3 driver, on top of GLFW and SDL2.
This allows to embed librw in graphics frameworks such as wxWidgets or Qt which provide OpenGL window & context creation without using GLFW nor SDL2.
An example of this usage is provided here: https://github.com/kaalkuul/librw-wxWidgets-starter
This starter kit demonstrates how to embed librw within a wxWidgets application (using the original fork for this PR).
This commit should also allow work in Qt GL windows but this has not been tested yet.