add caching to GlStateManager#glViewport
#3309
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Every
RenderPassobject created caused a non-memoized call toGL11#glViewport, usually with the same argumentsSumming up all instances of
GlStateManager#glViewportin a spark profile from a simple world with an uncapped framerate:Before: 214.6ms in 60s, or .35% of render thread [spark profile]
After: 3.2ms in 60s [spark profile]