[Keyboard Manager] Enable App-specific shortcuts in the KBM backend (#4628)

* 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

* Remove unused code

* Changed process checking step to include substrings

* Changed back to exact match included match without file extension

src/modules/keyboardmanager/test/TestHelpers.cpp

@@ -9,6 +9,7 @@ namespace TestHelpers
         input.ResetKeyboardState();
         input.SetHookProc(nullptr);
         input.SetSendVirtualInputTestHandler(nullptr);
+        input.SetForegroundProcess(L"");
         state.ClearSingleKeyRemaps();
         state.ClearOSLevelShortcuts();
     }