Move Settings to the API

[SchoolGuy]

Splitout of #2433

This PR aims to move the Settings into the API.

[codecov]

Codecov Report

Merging #2664 (3756281) into master (86fad29) will increase coverage by 0.01%.
The diff coverage is 90.00%.

@@            Coverage Diff             @@
##           master    #2664      +/-   ##
==========================================
+ Coverage   33.20%   33.22%   +0.01%     
==========================================
  Files          85       85              
  Lines       12395    12398       +3     
==========================================
+ Hits         4116     4119       +3     
  Misses       8279     8279              

Impacted Files	Coverage Δ
cobbler/cobbler_collections/manager.py	70.29% <50.00%> (ø)
cobbler/api.py	42.54% <100.00%> (+0.31%)	⬆️

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[nodeg]

LGTM.