Pytmd

- [docs: use sphinx-argparse v0.4.0](https://github.com/tsutterley/pyTMD/commit/555ec94bc600556a9a7e3880d84e35b945bce26e)
- [refactor: use f-strings for ascii and verbose output](https://github.com/tsutterley/pyTMD/commit/7cbfd82dcffaba1e14306da987e296d12e276441)
- chore: automatic time and bulletin updates

Bug fixes and updates to auxiliary time and EOP data files

- fix: MEEUS solar perigee rate
- fix: slimmer doc build for readthedocs
- fix: variable case for reading ATLAS compact files
- feat: add IERS https deltat sync
- feat: add IERS bulletin-A download
- ci: add workflow for appending delta times
- chore: update leap seconds list
- chore: update deltat file
- chore: update mean pole table
- chore: update finals file

Quick fixes
- fix: invert current masks for OTIS/ATLAS
- fix: add encoding to reading leap second files

feat: ascii file read updates to address https://github.com/tsutterley/pyTMD/issues/112 (https://github.com/tsutterley/pyTMD/pull/113)
feat: added delimiter option and datetime parsing in spatial class

Major refactor to remove all ICESat, ICESat-2 and OIB code 111 as proposed in 72

Release includes various fixes and improvements to the documentation.

- docs: slimmer environment file for prevent overutilization when building on readthedocs
- docs: updated structure of documentation
- fix: ocean pole tide test read
- fix: verify that input data is a masked array in bilinear interpolate
- fix: masking of netCDF4 ATLAS variables
- fix: place some imports behind try/except to include tools import