This adds [`XamlStyler.Console`] to our solution, and calls it when we
format the code, to also format
our .xaml files.
* `XamlStyler.Console` is a dotnet tool so it needs to be restored with
`dotnet tool restore`
* I've added a set of rules to approximately follow [@cmaneu's XAML guidelines].
Those guidelines also recommend things based on the code-behind, which
this tool can't figure out, but also _don't matter that much_.
* There's an extra step to strip BOMs from the output, since Xaml Styler
adds a BOM by default. Some had them before and others didn't. BOMs
have been nothing but trouble though.
[`XamlStyler.Console`]: https://github.com/Xavalon/XamlStyler
[@cmaneu's XAML guidelines]: https://github.com/cmaneu/xaml-coding-guidelines
* Created a ViewModel class in the Command Palette called
FilteredCommand, aggregating the Command, the filter and the
highlighted presentation of the command name
* This ListView of the filtered commands is bound to the vector of
FilteredCommands
* Introduced HighlightedTextControl user control with HighlightedText
view model
* Added this control to the ListView Item's grid
* Bound the FilteredCommand's highlighted command name to the user
control
## Validation Steps Performed
* UT for matching algorithm
* Only manual tests
* Searching in CommandLine, SwitchTab and Nested Command modes
* Checking for bot matching an non matching filters
* Dogfooding
Closes#6646
