OpenGL: Paper Sprites: The Thousands of Bugs

(Separate L and R sprites were broken, I figured out I was a dunce, oh noey)

added 3 commits

• ea915e57...54e92a96 - 2 commits from branch STJr:public_flatsprite
• 672ca125 - Merge branch 'public_flatsprite' of git@git.magicalgirl.moe:STJr/SRB2.git into public_flatsprite

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merged

mentioned in commit 5f09f608