[win32] WIN32Util: Add 'SmartFixWin32PathSlashes' and 'SimpleFixWin32PathSlashes' functions
[win32] Update WINSMBDirectory::GetLocal
URIUtils::AddSlashAtEnd: remove CStdString
URIUtils::IsDOSPath: cosmetic: update comment
[win32] WINSMBDirectory::GetDirectory: update, remove CStdString
[win32] WINFileSMB::GetLocal: update, remove CStdString
[win32] WIN32Util: add "ConverLocalPathToWin32Form()"
URIUtils::IsDVD: remove CStdString, win32 fixes