Pyxirr

- Add support for different day count conventions ([34](https://github.com/Anexen/pyxirr/pull/34))
- Upgrade Rust libraries
- Upgrade maturin to v0.14.13

- Upgrade Rust libraries
- Update package metadata

- Tweaked IRR to prefer rate > 0 ([24](https://github.com/Anexen/pyxirr/issues/24))
- All functions now accept date strings in the format yyyy-mm-dd or mm/dd/yyyy

- handle XIRR close to -1 (use brentq algorithm as fallback)

- Add an ability to suppress `InvalidPaymentsError` by passing `silent=True` flag ([22](https://github.com/Anexen/pyxirr/issues/22))
- Release the GIL for rust-only code
- Type hints
- Refactor tests (use `PyCFunction` interface instead of calling functions directly)
- Upgrade dependencies

- Support aarch64, armv7, s390x, ppc64le, ppc64 architectures
- Improve IRR calculation