Markdown writer

[erri120]

Part of #327.

Allows value formatters to write either plain text or markdown depending on the state.

This PR doesn't include a markdown renderer.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 16.66667% with 45 lines in your changes are missing coverage. Please review.

Project coverage is 54.18%. Comparing base (52df463) to head (1d0e894).
Report is 10 commits behind head on main.

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Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1102      +/-   ##
==========================================
- Coverage   54.35%   54.18%   -0.17%     
==========================================
  Files         671      672       +1     
  Lines       22175    22256      +81     
  Branches     1708     1709       +1     
==========================================
+ Hits        12053    12060       +7     
- Misses       9724     9802      +78     
+ Partials      398      394       -4     

Flag	Coverage Δ
Linux	53.45% <16.66%> (-0.20%)	⬇️
Windows	53.41% <16.66%> (-0.19%)	⬇️
clean_environment_tests	54.17% <16.66%> (-0.17%)	⬇️
macOS	53.00% <16.66%> (-0.13%)	⬇️
network_tests	?

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

Files	Coverage Δ
...cs/DiagnosticTemplateIncrementalSourceGenerator.cs	84.66% <100.00%> (-0.05%)	⬇️
...I/Controls/Diagnostics/DiagnosticEntryViewModel.cs	0.00% <ø> (ø)
...ions.Games.Diagnostics/Writer/IDiagnosticWriter.cs	0.00% <0.00%> (ø)
...p.UI/DiagnosticSystem/LoadoutReferenceFormatter.cs	0.00% <0.00%> (ø)
...s.App.UI/DiagnosticSystem/ModReferenceFormatter.cs	0.00% <0.00%> (ø)
....Games.Diagnostics/Writer/DiagnosticWriterState.cs	0.00% <0.00%> (ø)
...Mods.App.UI/DiagnosticSystem/NamedLinkFormatter.cs	0.00% <0.00%> (ø)
...usMods.App.UI/DiagnosticSystem/DiagnosticWriter.cs	0.00% <0.00%> (ø)
...sMods.Abstractions.Games.Diagnostics/Diagnostic.cs	23.33% <0.00%> (-3.59%)	⬇️
...rols/Diagnostics/DiagnosticEntryDesignViewModel.cs	0.00% <0.00%> (ø)

... and 8 files with indirect coverage changes

[Sewer56]

This is fine. Just extremely minor nitpicks.

Quick Question:

• Is the Mode intended to be dynamically mutated?

Usually for code like this, I see a design where you have a writer for a specific 'mode' and then you invoke methods for that. This isn't a request to change the code, just curious more than anything.

[erri120]

Quick Question:

* Is the `Mode` intended to be dynamically mutated?

Nope.