Galore

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- Minimum Python version has increased to 3.8
- Allow --xflip to be used with simple 1-d data plots (ajjackson)
- BUGFIX: Import type annoations from collection.abc. This is required
for Python 3.10, which deprecates the original location. (Hashan-Peiris)

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- Minimum Python version has increased to 3.7
- Orbital-projected plots have gained pretty fill colours; these are
controlled by `--no-fill`, `--no-total`, `--alpha` and
`--legend-cutoff` command-line options. (kavanase)

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- Continuous integration has been migrated from Travis to Github Actions
- Minimum Python version has been increased to 3.5.

- Python 3.4 was not available through Github actions. It is not wise to
support a platform we cannot test.

- BUGFIX: missing import affecting process_pdos

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- Updated setup.py to add a [vasp] extra; this handles Pymatgen
installation which can be tricky on older Python versions.
- Update the [vasp] extra to handle some compatibility breaks between
dependencies and different Python versions.
- Fix some incorrect values in Al k-alpha XPS cross-sections
- BUGFIX: Pymatgen CompleteDOS was not correctly accepted by galore.process_pdos()
- Implement previously ineffective "offset" option in
galore.plot.plot_pdos(), add a matching option to
galore.plot.plot_tdos()

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- BUGFIX: PDOS plot was failing for elemental systems

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- Matplotlib styling is exposed to the user: ``--style`` option selects CLI style
while Python API does not overrule existing style.
- The default TDOS line colour is now the first colour from the
selected style, which is usually blue. The previous default was a
bright red.
- Pymatgen CompleteDos objects can be processed directly.
- Dropped Python 2.7 compatability.
- Fixed PDOS bug introduced with Python3 cleanup