View Mod Contents First Draft & TreeDataGrid Improvements

[Sewer56]

fixes #989

Implementation includes:

• Dynamically changing icons on open/close.
• Custom theming for row headers and contents.
• Sorting, by name and size.
  • Including putting folders first, before files, to match common file explorer behaviour.
• Designer previews for everything.
• Backend code to support all of this.
• View correctly restores after app reboot.
• Asynchronous view loading.
• Cached ViewModels.
• A new 'Loading' and 'Error' view/panel.
• LoadoutGrid buttons are now disabled if unselected.
• Slightly improved LoadoutSynchronizer perf (side effect of making a change to AGamePathTree).
• App no longer displays trace logging in release builds (improves perf on small DB reads by ~70%).
• Subscribing to Tree Node VM in DynamicData is now lazy, improving perf to show a view.

Additional changes:

• Existing AdvancedInstaller dialogs now use a new TreeDataGrid helper to avoid repeated code.
• Fixed broken Virtualization in some cases of TreeDataGrid.
• TreeDataGrid columns can now be DI injected, instead of hardcoding them for each grid.
• Removed 1px header hack from 'AdvancedInstaller' by avoiding unnecessary Grid use.
• Removed unused x:Name declarations.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 23.63344% with 475 lines in your changes are missing coverage. Please review.

Project coverage is 55.30%. Comparing base (ec39298) to head (f992366).
Report is 20 commits behind head on main.

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Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1023      +/-   ##
==========================================
- Coverage   56.80%   55.30%   -1.50%     
==========================================
  Files         645      660      +15     
  Lines       21248    21888     +640     
  Branches     1656     1710      +54     
==========================================
+ Hits        12069    12105      +36     
- Misses       8783     9387     +604     
  Partials      396      396              

Flag	Coverage Δ
Linux	54.62% <23.63%> (-1.47%)	⬇️
Windows	54.45% <23.63%> (-1.57%)	⬇️
clean_environment_tests	55.28% <23.63%> (-1.51%)	⬇️
macOS	54.04% <23.63%> (-1.44%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files	Coverage Δ
...izers/Transformer/FlattenedToLoadoutTransformer.cs	85.85% <100.00%> (ø)
....UI/Content/Left/ModContent/ModContentViewModel.cs	96.00% <100.00%> (+8.50%)	⬆️
...aller.UI/Content/Right/Preview/PreviewViewModel.cs	91.66% <100.00%> (+12.87%)	⬆️
...nt/Right/SelectLocation/SelectLocationViewModel.cs	92.94% <100.00%> (+4.26%)	⬆️
...xusMods.App.UI/Controls/UnifiedIcon/UnifiedIcon.cs	79.10% <100.00%> (-0.31%)	⬇️
src/NexusMods.App.UI/Initializers.cs	60.00% <ø> (ø)
...pp.UI/LeftMenu/Loadout/LoadoutLeftMenuViewModel.cs	0.00% <ø> (ø)
...NexusMods.App.UI/Pages/MyGames/MyGamesViewModel.cs	100.00% <ø> (ø)
src/NexusMods.App.UI/Services.cs	98.63% <100.00%> (+0.11%)	⬆️
src/NexusMods.App.UI/TypeFinder.cs	100.00% <100.00%> (ø)
... and 24 more

... and 18 files with indirect coverage changes

[Patriot99]

See comments

[Patriot99]

How about such an alternative?

Suggested change

	<value>Mod Nie Znaleziony</value>
	<value>Nie znaleziono moda</value>

[Patriot99]

How about such an alternative?

Suggested change

	<value>Mod Nie Znaleziony</value>
	<value>Nie znaleziono moda</value>

[Al12rs]

I will ignore translations fixes for review since we can deal with them after this PR.

[Al12rs]

Moved stuff to #1048

[Al12rs]

A single leftover thing to fix and I think we can merge, all the rest should be handled in future PRs.
Any additional feedback (e.g. translations) can be added as an issue or items to #1048

[Al12rs]

I think a puppy died somewhere when you wrote this. Make this nullable or set it to the DummyLoadingViewModel.

[Al12rs]

Remaining issues will be handled in future PRs.