Rename GenericIcon to UnifiedIcon for clarity

[Al12rs]

Simple rename.

[codecov-commenter]

Codecov Report

Attention: 3 lines in your changes are missing coverage. Please review.

Comparison is base (8bd7919) 55.28% compared to head (6aef6a8) 55.33%.

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Additional details and impacted files

@@            Coverage Diff             @@
##             main     #947      +/-   ##
==========================================
+ Coverage   55.28%   55.33%   +0.05%     
==========================================
  Files         620      620              
  Lines       20058    20058              
  Branches     1545     1544       -1     
==========================================
+ Hits        11089    11100      +11     
+ Misses       8620     8614       -6     
+ Partials      349      344       -5     

Flag	Coverage Δ
Linux	54.73% <0.00%> (-0.01%)	⬇️
Windows	54.59% <0.00%> (+0.03%)	⬆️
clean_environment_tests	55.31% <0.00%> (+0.04%)	⬆️
networking_tests	?

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Files	Coverage Δ
...NexusMods.App.UI/Controls/UnifiedIcon/IconValue.cs	0.00% <ø> (ø)
...WorkspaceSystem/Controllers/WorkspaceController.cs	8.02% <ø> (ø)
...em/PanelTabHeader/PanelTabHeaderDesignViewModel.cs	0.00% <ø> (ø)
...ceSystem/PanelTabHeader/PanelTabHeaderViewModel.cs	0.00% <ø> (ø)
...xusMods.App.UI/Controls/UnifiedIcon/UnifiedIcon.cs	0.00% <0.00%> (ø)

... and 5 files with indirect coverage changes