Load XAML in YAML

[dalyIsaac]

Add support for loading XAML styles via YAML.

[codecov]

Codecov Report

Attention: Patch coverage is 50.00000% with 32 lines in your changes missing coverage. Please review.

Project coverage is 80.66%. Comparing base (e0f11b8) to head (f421510).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/Whim.Yaml/YamlLoader.cs	65.30%	15 Missing and 2 partials ⚠️
src/Whim.Yaml/ErrorWindow.xaml.cs	0.00%	15 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1075      +/-   ##
==========================================
+ Coverage   80.62%   80.66%   +0.03%     
==========================================
  Files         284      284              
  Lines       12808    12865      +57     
  Branches     1473     1483      +10     
==========================================
+ Hits        10327    10378      +51     
- Misses       2289     2292       +3     
- Partials      192      195       +3     

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