Custom, flexible `Version` implementation

[tony]

[codecov[bot]]

Codecov Report

Merging #351 (68443d6) into master (afb218e) will increase coverage by 0.11%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #351      +/-   ##
==========================================
+ Coverage   87.68%   87.80%   +0.11%     
==========================================
  Files          20       21       +1     
  Lines        1852     1869      +17     
  Branches      298      301       +3     
==========================================
+ Hits         1624     1641      +17     
  Misses        154      154              
  Partials       74       74              

Impacted Files	Coverage Δ
src/libtmux/common.py	84.03% <100.00%> (-0.08%)	:arrow_down:
tests/test_common.py	97.43% <100.00%> (ø)
tests/test_version.py	100.00% <100.00%> (ø)

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