CLI: Break up into modules

[tony]

No description provided.

[codecov]

Codecov Report

Merging #762 (4cbab8d) into master (4a4ff08) will increase coverage by 0.01%.
The diff coverage is 73.64%.

@@            Coverage Diff             @@
##           master     #762      +/-   ##
==========================================
+ Coverage   76.21%   76.22%   +0.01%     
==========================================
  Files           7       16       +9     
  Lines        1194     1241      +47     
  Branches      314      316       +2     
==========================================
+ Hits          910      946      +36     
- Misses        196      209      +13     
+ Partials       88       86       -2     

Impacted Files	Coverage Δ
tmuxp/cli/import_config.py	59.21% <59.21%> (ø)
tmuxp/cli/load.py	67.45% <67.45%> (ø)
tmuxp/cli/edit.py	70.00% <70.00%> (ø)
tmuxp/cli/freeze.py	74.62% <74.62%> (ø)
tmuxp/cli/utils.py	79.16% <79.16%> (ø)
tmuxp/cli/convert.py	82.75% <82.75%> (ø)
tmuxp/cli/shell.py	88.57% <88.57%> (ø)
tmuxp/cli/ls.py	92.30% <92.30%> (ø)
tmuxp/cli/constants.py	100.00% <100.00%> (ø)
tmuxp/cli/debug_info.py	100.00% <100.00%> (ø)

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