Compile fix - added missing forward declaration.
Made SetupObjectConstructors virtual so it can be more easily used from RCC++ code.
Adding missing license files.
Added FileWatcherWin32_AltImpl.h so that developers can use FindFirstChangeNotification instead of ReadDirectoryChanges if needed.
Merge pull request #30 from dougbinks/master

Compile fixes, added license files and alternative win32 file change notification.