Convert plotter to cli

[znicholls]

Pull request

Follows #9

Please confirm that this pull request has done the following:

• Tests added
• Documentation added (where applicable)
• Example added (either to an existing notebook or as a new notebook, where applicable) (N/A as not production ready yet, see Testing quantile rolling windows cruncher #16)
• Description in CHANGELOG.rst added

Adding to CHANGELOG.rst

Please add a single line in the changelog notes similar to one of the following:

- (`#XX <https://github.com/znicholls/silicone/pull/XX>`_) Added feature which does something
- (`#XX <https://github.com/znicholls/silicone/pull/XX>`_) Fixed bug identified in (`#YY <https://github.com/znicholls/silicone/issues/YY>`_)

@Rlamboll this is my first step of putting #11 into the package.

[codecov]

Codecov Report

Merging #13 into master will decrease coverage by 6.09%.
The diff coverage is 92.06%.

@@           Coverage Diff            @@
##           master     #13     +/-   ##
========================================
- Coverage     100%   93.9%   -6.1%     
========================================
  Files           5       8      +3     
  Lines          69     246    +177     
  Branches        8      41     +33     
========================================
+ Hits           69     231    +162     
- Misses          0      11     +11     
- Partials        0       4      +4

Impacted Files	Coverage Δ
src/silicone/database_crunchers/base.py	100% <100%> (ø)	⬆️
src/silicone/utils.py	100% <100%> (ø)	⬆️
src/silicone/cli.py	100% <100%> (ø)
src/silicone/database_crunchers/lead_gas.py	100% <100%> (ø)	⬆️
src/silicone/database_crunchers/__init__.py	100% <100%> (ø)	⬆️
...one/database_crunchers/quantile_rolling_windows.py	87.5% <87.5%> (ø)
src/silicone/plotting.py	92.68% <92.68%> (ø)

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[znicholls]

@Rlamboll this is ready for review. I would suggest we do this and then do #14/#15 as there's a few things in here which will be useful there.

As it stands it's a bit rough, but I can't actually do any better until we work out how to test the rolling windows quantile cruncher so I think we should just merge this and fix it up when we address #16.

[znicholls]

Python 3.5 seems to not play ball with os.path.join so I'm going to suggest we drop support for that here too.

[Rlamboll]

Several parts of this will need patching before we continue (in particular checks for the statistics for the cruncher) but it's easier to do that as a separate patch now.

[Rlamboll]

Work still needed for more tests, but to be done as a separate pull request.