#6 [DO NOT SQUASH] Performance improvements for vector.lua

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pgimeno wants to merge 2 commits from pgimeno/pg-accelerate-dir2rot into pgimeno/master

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Upphovsman SHA1 Meddelande Datum
  Pedro Gimeno 90f34f3151 Replace vector.dir_to_rotation with a faster one 4 år sedan
  Pedro Gimeno 82c56e2cd0 vector.lua: Cache math functions in locals 4 år sedan