MUI capabilities for GWin32RegistryKey
This MR changes GWin32RegistryKey to allow get_value() functions to automatically load resource strings, which is used for localization (sometimes) and by UWP (always).
This change is to the GWin32RegistryKey and not to our utility function read_resource_string()
because the OS API that does resource loading is also tied to Windows Registry API.
Edited by LRN