Ability to set your own game version in AGame

[Aragas]

To have the same functionality, you have to override AGame.Installations with copying the AGame.GetInstallations() method

[codecov]

Codecov Report

Merging #684 (f8dcf60) into main (ec242b2) will increase coverage by 64.53%.
The diff coverage is n/a.

@@            Coverage Diff            @@
##           main     #684       +/-   ##
=========================================
+ Coverage      0   64.53%   +64.53%     
=========================================
  Files         0      633      +633     
  Lines         0    18145    +18145     
  Branches      0     1176     +1176     
=========================================
+ Hits          0    11709    +11709     
- Misses        0     6134     +6134     
- Partials      0      302      +302     

Flag	Coverage Δ
Linux	63.84% <ø> (?)
Windows	63.75% <ø> (?)
clean_environment_tests	64.51% <ø> (?)

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Files	Coverage Δ
src/NexusMods.DataModel/Games/AGame.cs	65.11% <ø> (ø)

... and 632 files with indirect coverage changes