Add more data and config search paths on macOS

[adrg]

• Append ~/.local/share to XDG_DATA_DIRS default locations.
• Append ~/.config to XDG_CONFIG_DIRS default locations.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (0d710b1) to head (1d38818).
Report is 4 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##            master       #97   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            9         9           
  Lines          424       428    +4     
=========================================
+ Hits           424       428    +4     

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