Remove support for deprecated macOS XML wifi list.

[m3nu]

Take known Wifis from other profiles, rather than system.

Fixes #766

[codecov-io]

Codecov Report

Merging #868 (3c11ec0) into master (bd0a1b8) will increase coverage by 0.12%.
The diff coverage is 85.71%.

@@            Coverage Diff             @@
##           master     #868      +/-   ##
==========================================
+ Coverage   73.22%   73.35%   +0.12%     
==========================================
  Files          55       55              
  Lines        3735     3715      -20     
==========================================
- Hits         2735     2725      -10     
+ Misses       1000      990      -10     

Impacted Files	Coverage Δ
src/vorta/network_status/network_manager.py	73.77% <66.66%> (ø)
src/vorta/network_status/darwin.py	66.66% <83.33%> (+6.32%)	⬆️
src/vorta/network_status/abc.py	88.23% <100.00%> (ø)
src/vorta/utils.py	63.77% <100.00%> (-0.23%)	⬇️

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