[stdstring] get rid of CStdString in PVRDatabase, PVRGUIInfo, PVRManager
[stdstring] get rid of CStdString in pvr/addons
[stdstring] get rid of CStdString in pvr/channels
[stdstring] get rid of CStdString in pvr/recordings
[stdstring] get rid of CStdString in pvr/timers
[stdstring] get rid of CStdString in pvr/dialogs
[stdstring] get rid of CStdString in pvr/windows
[cleanup] use std:: instead of using namespace std in PVRDatabase, PVRGUIInfo and PVRManager
[cleanup] use std:: instead of using namespace std in pvr/addons
[cleanup] use std:: instead of using namespace std in pvr/channels
[cleanup] use std:: instead of using namespace std in pvr/dialogs
[cleanup] use std:: instead of using namespace std in pvr/timers
[cleanup] use std:: instead of using namespace std in pvr/windows