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Added some test files for fixed point math.
Something definitely broke in cosine when I changed to smaller tables (which shouldn't have sacrificed any accuracy). Need to investigate...
Initial pass at a 32-bit fixed point library.
- Generated cosine / sine tables, put them in PROGMEM
- Wrote initial quadratic interpolation cosine function. ... not safe to use yet, but it seems to work for non-edge cases. Need to write a better way to test it.