Pane, Window: Improve parsing of option values

[tony]

Changes

Pane, Window: Improve parsing of option values

Integers are now parsed more reliably

[codecov]

Codecov Report

Attention: 3 lines in your changes are missing coverage. Please review.

Comparison is base (db775fc) 89.15% compared to head (5133fb4) 89.10%.

❗ Current head 5133fb4 differs from pull request most recent head 4d79151. Consider uploading reports for the commit 4d79151 to get more accurate results

Files	Patch %	Lines
src/libtmux/window.py	60.00%	2 Missing ⚠️
src/libtmux/pane.py	0.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #520      +/-   ##
==========================================
- Coverage   89.15%   89.10%   -0.05%     
==========================================
  Files          36       36              
  Lines        3559     3562       +3     
  Branches      501      501              
==========================================
+ Hits         3173     3174       +1     
- Misses        265      267       +2     
  Partials      121      121              

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