ENH: add preliminary archive file support

[klauer]

Closes #139

See the related issue + docs for further information.

• [x] Fix nested imports
• [x] Add better tests
• [x] Docs

[codecov-io]

Codecov Report

Merging #162 into master will increase coverage by 0.76%. The diff coverage is 91.96%.

@@            Coverage Diff             @@
##           master     #162      +/-   ##
==========================================
+ Coverage   78.63%   79.39%   +0.76%     
==========================================
  Files          17       17              
  Lines        2031     2097      +66     
==========================================
+ Hits         1597     1665      +68     
+ Misses        434      432       -2

Impacted Files	Coverage Δ
pytmc/bin/pytmc.py	80.85% <100%> (+0.85%)	:arrow_up:
pytmc/bin/pragmalint.py	84.37% <100%> (+0.6%)	:arrow_up:
pytmc/bin/db.py	48.48% <80%> (+3.54%)	:arrow_up:
pytmc/pragmas.py	96.33% <89.18%> (+1.18%)	:arrow_up:
pytmc/record.py	94.25% <97.82%> (+1.78%)	:arrow_up:

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[klauer]

As you'll likely be one of the first users, @ZLLentz, feel free to chime in if the PR makes sense from the perspective of defaults + pragmas. Review-wise @n-wbrown has things covered - unless you feel so inclined.

[n-wbrown]

This all looks very solid to me. You can merge when ready.