Pyfastani

Added
- `pickle` protocol implementation to `Mapper` and `Sketch` via `__getstate__` and `__setstate__`.
- `Minimizers` class to access the minimizers of a `Sketch` or `Mapper` object.

Changed
- Make `Sketcher` and `Mapper` final.
- Prevent direct instantiation of `Mapper` objects.
- Update `Mapper._query_draft` to recycle memory between fragments.
- Vendor `Boost::math` headers (`v1.79`) to allow compiling without depdendencies.

Fixed
- Broken compilation of `_fastani` extension module as `universal2` binaries on MacOS.

Fixed
- Missing header files in the `tar.gz` distribution, preventing compilation of the wheel from source.

Added
- `Sketch.clear` method to remove all sequences currently in a `Sketch` and reset the list of minimizers.
- SIMD code to read and reverse-complement the input sequences efficiently on supported platforms (x86-64 with SSE2 or SSSE3, and ARM with NEON).
Changed
- Split the `Sketch` type in two depending on whether the object is at the sketching stage (`Sketch`) or at the querying stage (`Mapper`).
- `Sketch.add_genome`, `Sketch.add_draft`, `Mapper.query_genome` and `Mapper.query_draft` can now be passed a Unicode string for the sequence.
Fixed
- Integer underflow causing minimizers out of the block window to be added to the final minimizers list.

Changed
- Querying functions now release GIL to allow efficient parallel querying.

Fixed
- Source distribution missing Cython and C++ sources, thus preventing compilation.

Initial release.