[QuickAccent] Add description of current selected letter (#20587)

* Adding unicode names and adjusting UI (WIP)

* Added changing letter names

* Add optioins to hide description (WIP)

* WIP

* Change to binding property

* Adress PR comments

* Set TextBlock in border

* * Added to settings
* Fixed string showing/not showing one time after switching character
* Removed unneccessairy command in SettingsService.cs
* Moved showdescription enum to settings.ui

* Adding Fluent design :)

* Fix merge errors

* Center list

* Fixed code not working. Accepted some code style changes.

* Merge main in branch #2

* [Quick Accent] support unicode description for UTF-16 surrogate pairs

* [Quick Accent] fix check-spelling-bot errors

* [check-spelling] accept LANGID as correct word

* [Quick Accent] fix delay when calling ShowToolbar for the first time

* [Quick Accent] use toggle switch to turn off/on Unicode description

* [Quick Accent] fix after merge

* [Quick Accent] add UnicodeInformation.dll to installer

Co-authored-by: Niels Laute <niels.laute@live.nl>

src/modules/poweraccent/PowerAccent.UI/App.xaml.cs

@@ -17,9 +17,8 @@ namespace PowerAccent.UI
         protected override void OnStartup(StartupEventArgs e)
         {
             const string appName = "QuickAccent";
-            bool createdNew;
 
-            _mutex = new Mutex(true, appName, out createdNew);
+            _mutex = new Mutex(true, appName, out bool createdNew);
 
             if (!createdNew)
             {