Merge pull request HarryR#61 from HarryR/miximus-cleanup

Merkle fixes, Miximus cleanup + security fix

Merge pull request HarryR#51 from HarryR/python-field

Added FQ from py_ecc, changed shamir poly tests to use it

Merge pull request HarryR#34 from HarryR/reduce-build-times

Reduce build times + C++ style improvements