Remove explicit runtime-tmpdir and move installation to install phase

[AutonomicPerfectionist]

This PR removes the explicit --runtime-tmpdir option to PyInstaller, allowing it to extract to the system-specific tmp directory. It also moves the installation of the generated binary to the install phase rather than the build phase.

Fixes #59 and helps with #39

[codecov[bot]]

Codecov Report

Merging #60 (42cff93) into master (d544b42) will increase coverage by 85.65%. The diff coverage is 96.87%.

@@             Coverage Diff             @@
##           master      #60       +/-   ##
===========================================
+ Coverage        0   85.65%   +85.65%     
===========================================
  Files           0        9        +9     
  Lines           0      955      +955     
===========================================
+ Hits            0      818      +818     
- Misses          0      137      +137     

Flag	Coverage Δ
unittests	85.65% <96.87%> (?)

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Impacted Files	Coverage Δ
cminx/__init__.py	89.74% <92.85%> (ø)
cminx/documenter.py	100.00% <100.00%> (ø)
cminx/parser/aggregator.py	89.89% <100.00%> (ø)
cminx/rstwriter.py	98.21% <100.00%> (ø)
cminx/parser/CMakeParser.py	69.64% <0.00%> (ø)
cminx/parser/CMakeLexer.py	100.00% <0.00%> (ø)
cminx/parser/CMakeListener.py	84.00% <0.00%> (ø)
cminx/parser/__init__.py	100.00% <0.00%> (ø)
... and 3 more

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