Rendertarget review#388

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sbusch42 wants to merge 3 commits intomasterfrom

rendertarget_review

Commits on Jul 16, 2017

Review RenderInterface. Simplify interface a bit, add more comments
Stefan Buschmann
committed
Merge remote-tracking branch 'origin/master' into rendertarget_review
Stefan Buschmann
committed
Fix bug in blit stage if render target is invalid. We must *never* assume that an input contains a valid value, and always check for nullptr values
Stefan Buschmann
committed