create HTML representation of parsed makefile

[linuxlizard]

Intial pass of adding HTML output. Work in progress.

[codecov-commenter]

Codecov Report

Merging #5 (4822dc1) into master (fe77d62) will decrease coverage by 0.18%.
The diff coverage is 33.33%.

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@@            Coverage Diff             @@
##           master       #5      +/-   ##
==========================================
- Coverage   54.60%   54.42%   -0.18%     
==========================================
  Files          25       26       +1     
  Lines        3115     3140      +25     
  Branches      621      627       +6     
==========================================
+ Hits         1701     1709       +8     
- Misses       1278     1295      +17     
  Partials      136      136              

Flag	Coverage Δ
unittests	54.42% <33.33%> (-0.18%)	⬇️

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Impacted Files	Coverage Δ
pymake/pymake.py	17.04% <0.00%> (-0.40%)	⬇️
pymake/html.py	40.00% <40.00%> (ø)
pymake/rules.py	28.00% <75.00%> (+1.61%)	⬆️

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