[Keyboard Manager] Add JSON support for App Specific shortcuts (#4840)

* Enable app specific shortcut remapping

* Fixed lowercase function call

* Add test file

* Moved GetForegroundProcess to II and added tests

* Fixed runtime error while testing due to heap allocation across dll boundary

* Renamed function

* Changed shortcutBuffer type

* Linked App specific UI to backend

* Added shortcut validation logic on TextBox LostFocus handler

* Moved Validate function and changed default text

* Changed to case insensitive warning check

* Changed to case insensitive warning check at OnClickAccept

* Fixed alignment and spacing issues

* Added app-specific JSON support in backend

* Updated landing page

* Make listview horizontally scrollable

* Added tests

* Consider all case variants of All Apps in textbox to be global shortcuts

src/core/Microsoft.PowerToys.Settings.UI.Lib/ShortcutsKeyDataModel.cs

@@ -12,9 +12,13 @@ namespace Microsoft.PowerToys.Settings.UI.Lib
         [JsonPropertyName("global")]
         public List<KeysDataModel> GlobalRemapShortcuts { get; set; }
 
+        [JsonPropertyName("appSpecific")]
+        public List<AppSpecificKeysDataModel> AppSpecificRemapShortcuts { get; set; }
+
         public ShortcutsKeyDataModel()
         {
             GlobalRemapShortcuts = new List<KeysDataModel>();
+            AppSpecificRemapShortcuts = new List<AppSpecificKeysDataModel>();
         }
     }
 }