Make it usable on non-SSE platforms (#60)
Make it usable on non-SSE platforms (#60)

* at one place HANDMADE_NO_SSE instead of HANDMADE_MATH_NO_SSE was used
* introduce HANDMADE_MATH__USE_SSE for the SSE #ifdefs throughout code
  - use #ifdef HANDMADE_MATH_NO_SSE at only one place
* only use SSE (#define HANDMADE_MATH__USE_SSE) if the targetplatform
  actually supports it
  => users don't have to #define HANDMADE_MATH_NO_SSE on ARM etc
* at one place HMM_SqrtF instead of HMM_SquareRootF was used
HandmadeMath/Handmade-Math,HandmadeMath/Handmade-Math