vec2 optimizations
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Optimize client and server vector operations mostly by replacing lots of eX * a + eY * b with vec2(a, b).
While performance boost is very marginal, it improves code readability a little bit (I've also split some very long instructions with the introduction of intermediate variables) -
Document vec2, AUTOCVAR and AUTOCVAR_SAVE usage, which isn't very intuitive for everybody by reading the implementation