math: include the API declaration to ensure implementation matches
ut: add unit tests for misc_math.c functions
unit test: add license headers and pointers to google test docs
ut misc_math: allow +180 or -180 as valid and correct for 180deg errors
ut misc_math: test a much larger multiple of 360deg around +/-180
ut misc_math: remove disabled reversed min/max test
Merge pull request #473 from solidgoldbomb/math-unit-tests

Math unit tests