[WIP] Add more commands

[phlax]

add commands for listing/updating the Makeyfile

[codecov]

Codecov Report

Merging #4 into master will decrease coverage by 4.06%.
The diff coverage is 20.4%.

@@            Coverage Diff             @@
##           master       #4      +/-   ##
==========================================
- Coverage    99.9%   95.84%   -4.07%     
==========================================
  Files          34       33       -1     
  Lines        1106      962     -144     
==========================================
- Hits         1105      922     -183     
- Misses          1       40      +39

Impacted Files	Coverage Δ
makeyfile/commands/list.py	0% <0%> (-100%)	⬇️
makeyfile/commands/base.py	0% <0%> (-100%)	⬇️
makeyfile/commands/dot.py	0% <0%> (ø)
makeyfile/commands/get.py	0% <0%> (ø)
makeyfile/commands/dump.py	0% <0%> (-100%)	⬇️
tests/makey.py	100% <100%> (ø)	⬆️
makeyfile/runner.py	96.96% <0%> (-0.81%)	⬇️
makeyfile/runners/sequence.py	100% <0%> (ø)	⬆️
makeyfile/contextmanagers.py	100% <0%> (ø)	⬆️
tests/runner.py	100% <0%> (ø)	⬆️
... and 11 more

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