added ability to change focus active pane size percentage

[graemedavidson]

• Menu selection bound to (T)
• Conf setting and example adding current percentage setting value to Status Bar
  • Errors on invalid setting
• Mounts .tmux.conf into docker test image

Issue: #6

[codecov-commenter]

Codecov Report

Merging #9 (44cdf6a) into install-tmux-by-tar (31c9f71) will decrease coverage by 7.15%. The diff coverage is 4.76%.

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@@                   Coverage Diff                   @@
##           install-tmux-by-tar       #9      +/-   ##
=======================================================
- Coverage                40.47%   33.33%   -7.15%     
=======================================================
  Files                        2        3       +1     
  Lines                       84      102      +18     
=======================================================
  Hits                        34       34              
- Misses                      50       68      +18     

Flag	Coverage Δ
unittests	33.33% <4.76%> (-7.15%)	:arrow_down:

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
scripts/focus.sh	0.00% <0.00%> (ø)
scripts/update-pane-percentage-size.sh	0.00% <0.00%> (ø)
scripts/functions.sh	66.66% <100.00%> (ø)

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