[win32] add GUIWindowTV and GUIWindowRadio cpp/h to project
[gui] new gui info properties PVR.HasTVChannels and PVR.HasRadioChannels
[confluence] hide TV/Radio menu entry if no channels exist
[fix] adds missing m_bIsRadio property to operators in CPVRTimerInfoTag
[pvr] separates timer for tv and radio
[confluence] improving skin code for timer view
[pvr] separates search for tv and radio
[confluence] improving skin code for search view