[PowerRename] Handle many items w/o crashing and OOM (#26761)

* [PowerRename] Disable AnimatedIcon (check mark) for CheckBox to prevent crashes
* [PowerRename] Implement lightweight ExplorerItemsSource/VM

src/modules/powerrename/PowerRenameUILib/Utils.h

@@ -0,0 +1,25 @@
+// Copyright (c) Microsoft Corporation.
+// Licensed under the MIT license.
+
+#pragma once
+
+// This macro defines a dependency property for a WinRT class.
+// Use this in your class' header file after declaring it in the idl.
+// Remember to register your dependency property in the respective cpp file.
+#define DEPENDENCY_PROPERTY(type, name)                                    \
+public:                                                                    \
+    static winrt::Microsoft::UI::Xaml::DependencyProperty name##Property() \
+    {                                                                      \
+        return _##name##Property;                                          \
+    }                                                                      \
+    type name() const                                                      \
+    {                                                                      \
+        return winrt::unbox_value<type>(GetValue(_##name##Property));      \
+    }                                                                      \
+    void name(const type& value)                                           \
+    {                                                                      \
+        SetValue(_##name##Property, winrt::box_value(value));              \
+    }                                                                      \
+                                                                           \
+private:                                                                   \
+    static winrt::Microsoft::UI::Xaml::DependencyProperty _##name##Property;