More efficient updating of TEV state

[wheremyfoodat]

Moves TEV state parsing to vertex shader to avoid 5 uniform uplodads per draw call + some memory moves

[wheremyfoodat]

Thoughts (and prayers appreciated) @Wunkolo @GPUCode @fleroviux @skylersaleh

[fleroviux]

This seems like the logical thing to do now that we have access to all PICA IO in the shader. LGTM!

[wheremyfoodat]

re: Discord

Will switch to reading in the fragment shade instead to avoid going over input/output attribute caps