Platformdirs

[sjsrey]

platformdirs is the apparent successor to appdirs.

This moves to platformdirs and adds test coverage.

[codecov]

Codecov Report

Merging #481 (3ebd86f) into master (284d2ae) will increase coverage by 0.1%.
The diff coverage is 100.0%.

@@           Coverage Diff            @@
##           master    #481     +/-   ##
========================================
+ Coverage    79.3%   79.4%   +0.1%     
========================================
  Files         121     121             
  Lines       12973   12995     +22     
========================================
+ Hits        10285   10316     +31     
+ Misses       2688    2679      -9     

Impacted Files	Coverage Δ
libpysal/examples/base.py	64.4% <100.0%> (ø)
libpysal/examples/tests/test_available.py	94.3% <100.0%> (+9.7%)	⬆️
libpysal/_version.py	40.7% <0.0%> (+2.7%)	⬆️