Add support for double and float

[flippmoke]

Currently the wagyu algorithm only works with integers, however, with some fine tuning it might be possible to support floating point numbers.

Steps:

• [ ] Use Approximate equality
  • [ ] slope
  • [ ] is_maxima
  • [ ] is_intermediate
  • [ ] eveywhere in point.hpp
• [ ] Add range to snap rounding? Disable snap rounding?
• [ ] Adjust topology correction?
• [ ] Update poly2_contains_poly1 to handle floating points
• [ ] Fix edge building for floating points