Merged QuickLook.Common from submodule

https://github.com/QL-Win/QuickLook.Common/commit/529d07b56577b88329481cdac8f2a6a175b6c21a

QuickLook.Common/Commands/RelayCommand.cs

@@ -0,0 +1,36 @@
+// Copyright © 2017-2026 QL-Win Contributors
+//
+// This file is part of QuickLook program.
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+using System;
+using System.Windows.Input;
+
+namespace QuickLook.Common.Commands;
+
+public class RelayCommand(Action execute, Func<bool> canExecute = null) : ICommand
+{
+    private readonly Action _execute = execute;
+    private readonly Func<bool> _canExecute = canExecute;
+
+    public bool CanExecute(object parameter) => _canExecute?.Invoke() ?? true;
+
+    public void Execute(object parameter) => _execute();
+
+    public event EventHandler CanExecuteChanged;
+
+    public void RaiseCanExecuteChanged() =>
+        CanExecuteChanged?.Invoke(this, EventArgs.Empty);
+}