Initial add of PowerRename from SmartRename repo (#499)

* Initial add of PowerRename from SmartRename repo

src/modules/powerrename/dll/PowerRenameExt.h

@@ -0,0 +1,61 @@
+#pragma once
+#include "stdafx.h"
+
+class CPowerRenameMenu :
+    public IShellExtInit,
+    public IContextMenu
+{
+public:
+    CPowerRenameMenu();
+
+    // IUnknown
+    IFACEMETHODIMP QueryInterface(_In_ REFIID riid, _COM_Outptr_ void** ppv)
+    {
+        static const QITAB qit[] =
+        {
+            QITABENT(CPowerRenameMenu, IShellExtInit),
+            QITABENT(CPowerRenameMenu, IContextMenu),
+            { 0, 0 },
+        };
+        return QISearch(this, qit, riid, ppv);
+    }
+
+    IFACEMETHODIMP_(ULONG) AddRef()
+    {
+        return InterlockedIncrement(&m_refCount);
+    }
+
+    IFACEMETHODIMP_(ULONG) Release()
+    {
+        LONG refCount = InterlockedDecrement(&m_refCount);
+        if (refCount == 0)
+        {
+            delete this;
+        }
+        return refCount;
+    }
+
+    // IShellExtInit
+    STDMETHODIMP Initialize(_In_opt_ PCIDLIST_ABSOLUTE pidlFolder, _In_ IDataObject* pdto, HKEY hkProgID);
+
+    // IContextMenu
+    STDMETHODIMP QueryContextMenu(HMENU hMenu, UINT index, UINT uIDFirst, UINT uIDLast, UINT uFlags);
+    STDMETHODIMP InvokeCommand(_In_ LPCMINVOKECOMMANDINFO pCMI);
+    STDMETHODIMP GetCommandString(UINT_PTR, UINT, _In_opt_ UINT*, _In_ LPSTR, UINT)
+    {
+        return E_NOTIMPL;
+    }
+
+    static HRESULT s_CreateInstance(_In_opt_ IUnknown* punkOuter, _In_ REFIID riid, _Outptr_ void** ppv);
+    static DWORD WINAPI s_PowerRenameUIThreadProc(_In_ void* pData);
+
+    static bool SetEnabled(_In_ bool enabled);
+    static bool IsEnabled();
+
+private:
+    ~CPowerRenameMenu();
+
+    long m_refCount = 1;
+    CComPtr<IDataObject> m_spdo;
+};
+