Pyometiff

what's new
- fix bug where Pixel objects with no Channels would cause OMETIFFReader to crash
- support for python 3.10 / 3.11 (drop support for < 3.8)

support for python 3.10+

fixed bug where parse_metadata did not actually accept user-provided metadata strings 6 (thanks vladpopovici)

minor, just for zenodo tracking

resolved minor bugs

- can now choose to enable or disable BigTiff encoding with the `bigtiff` option in `OMETIFFWriter`
- minor fixes