Migrate power rename MRU lists from registry to JSON (#2090)

* Handle most recently used search/replace strings within settings.

* Check for last modified time of json file and reload it if needed.

* Handle changes in MRU search / replace lists size.

* Improve handling of changes in MRU list size.

* Don't check for last modified time in every getter method. Load only when starting application.

* Add const identifier to getter methods.

* Address PR comments: Add const to reg and json file paths and set them in constructor initializer. Check pushIdx validity. Move implementation to cpp of PowerRenameUI constructor.

* Add error checking when getting values from registry.

src/modules/powerrename/ui/PowerRenameUI.cpp

@@ -5,7 +5,6 @@
 #include <commctrl.h>
 #include <Shlobj.h>
 #include <helpers.h>
-#include <settings.h>
 #include <windowsx.h>
 #include <thread>
 #include <trace.h>
@@ -80,6 +79,14 @@ inline int RECT_HEIGHT(RECT& r)
     return r.bottom - r.top;
 }
 
+CPowerRenameUI::CPowerRenameUI() :
+    m_refCount(1)
+{
+    CSettingsInstance().Load();
+    (void)OleInitialize(nullptr);
+    ModuleAddRef();
+}
+
 // IUnknown
 IFACEMETHODIMP CPowerRenameUI::QueryInterface(__in REFIID riid, __deref_out void** ppv)
 {