Adds an "about" controller

[Spuds]

Central area to Manage contact and about style actions ... moves various functions from various controllers to a centralized about/contact area

[codecov]

Codecov Report

Attention: Patch coverage is 1.56250% with 126 lines in your changes are missing coverage. Please review.

Project coverage is 33.04%. Comparing base (82c43aa) to head (205dd0f).
Report is 1 commits behind head on development.

Files	Patch %	Lines
sources/ElkArte/Controller/About.php	0.00%	117 Missing ⚠️
sources/subs/Who.subs.php	0.00%	5 Missing ⚠️
sources/ElkArte/Controller/Register.php	0.00%	2 Missing ⚠️
sources/ElkArte/UserSettingsLoader.php	0.00%	1 Missing ⚠️
sources/subs/Menu.subs.php	0.00%	1 Missing ⚠️

Additional details and impacted files

@@                Coverage Diff                @@
##             development    #3782      +/-   ##
=================================================
+ Coverage          33.01%   33.04%   +0.02%     
- Complexity         12906    12911       +5     
=================================================
  Files                288      289       +1     
  Lines              62496    62440      -56     
=================================================
  Hits               20633    20633              
+ Misses             41863    41807      -56     

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