[RFC,WIP] Initial experimental SDL2 support#234

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sjnewbury wants to merge 2 commits intoOoliteProject:masterfrom

sjnewbury:SDL2-RFC

Commits on Jun 29, 2017

Clone SDL into SDL2
sjnewbury
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Commits on Jul 1, 2017

This is an initial (mostly working) port to SDL2.
sjnewbury
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