Added
- `scoring-matrices` dependency to handle alternative scoring matrices.
- `scoring_matrix` argument to `Aligner` constructor to use a non-default matrix ([3](https://github.com/althonos/pyfamsa/issues/3)).
Fixed
- Use of outdated `importlib.resources` interface in `pyfamsa.tests` package.
- Missing defines for compilation of NEON code on non-Aarch64 Arm platforms.