Project now passes flake8 and black linter (also including more rst
cleanup). Moved latex related things to dedicated ``latex.py`` module,
and removed the ``makesheets -dF`` call from travis.
- Circle now properly reflects the druid's available wild_shapes
- Unavaiable wild_shapes are not listed on the sheet but ghosted.
- ``spells`` is now longer relevant, only use ``spells_prepared`` in
the character file.