Migrate files from Wox to PowerLauncher (#5014)

* Moved all files from Wox to Powerlauncher

* Removed Wox project

* Changed namespace for imported files

* Resolved errors for VM

* Added build dependency order

* Fixed errors in helper class

* Remove Wox files

* Fixed errors in SingleInstance class

* Fixed wox.tests

* Fixed MSI

* Removed obsolete methods from PublicAPI

* nit fixes

* Throw null exception

* Fix merge conflict

src/modules/launcher/PowerLauncher/ViewModel/RelayCommand.cs

@@ -0,0 +1,31 @@
+using System;
+using System.Windows.Input;
+
+namespace PowerLauncher.ViewModel
+{
+    public class RelayCommand : ICommand
+    {
+        private Action<object> _action;
+
+        public RelayCommand(Action<object> action)
+        {
+            _action = action;
+        }
+
+        public virtual bool CanExecute(object parameter)
+        {
+            return true;
+        }
+
+        public event EventHandler CanExecuteChanged
+        {
+            add { }
+            remove { }
+        }
+
+        public virtual void Execute(object parameter)
+        {
+            _action?.Invoke(parameter);
+        }
+    }
+}