Sdss-marvin

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- Restructuring to simplify setup, dependencies, and tests, for code health.
- **Adds** - New `setup.py` and `setup.cfg` to simplify installation and dependency requirements
- **Adds** - New dependencies ``marvin-brain``, ``marvin-wtforms-alchemy``, ``marvin-sqlalchemy-boolean-search``, ``sdss-tree``, and ``sdss-access``.
- **Changes** - Migrates to ``sdsstools`` for internal logging and config management.
- **Changes** - Removes all external submodules, which have been converted into pypi releases.
- **Changes** - Moves tests outside the python package
- **Fixes** - Issues :issue:`643`, :issue:`644`, :issue:`645`, :issue:`646`

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- **Fixes** :issue:`711` - galaxy page bug when NSA dictionary not available prevents flag modals from appearing

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- **Adds** - support for MaNGA data release MPL-10
- **Removes** - web / API support for MPLs 4, 5, 6
- **Removes** - SPX and VOR10 binning schemese in MPLs 7-10, and DR15-16.

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- **Adds** - support for using the marvin mirror at magrathea.sdss.org, hosted at Johns Hopkins
- **Adds** - new `use_mirror` custom config option to automatically set marvin to use the mirror

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- **Adds** - caching web routes on Plate, Galaxy pages
- **Adds** - new `use_cache` option to `Cachable Query` class. Implemented in most marvin database calls.
- **Adds** - most Marvin Tools now use query caching for database calls
- **Adds** - a new `CacheMixIn` that adds optional caching to classes utilizing db calls
- **Adds** - a new `Redis` `dogpile.cache` backend; with new regions for `Maps` and `Modelcubes`
- **Adds** - new utility functions for DRPall, and DAPall files, `get_xxx_path`, `get_xxx_file`, `get_xxx_table`
- **Adds** - adds visual morphology VAC for DR16+
- **Fixes** - Issue :issue:`695` - better web spectra/map error messages;
- **Changes** - tree and sdss_access submodules to latest 3.0+ and 1.0+ versions
- **Changes** - path changes to accommodate new tree and sdss_access

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Fixed
^^^^^
- Issue :issue:`700` - pinned webargs package to version <6, networkx package <2.4