URIUtils: add 'FixSlashesAndDups()' function
[win32] WIN32Util: add "ConvertPathToWin32Form()" function
[win32] WINSMBDirectory: Update, remove CStdString
[win32] WINFileSMB::GetLocal: update, remove CStdString
HDDirectory: error checks, update for Win32
HDFile: remove CStdString, update for win32