[airplay] - read airplay/airtunes announcements from userdata/airplay.xml if present
[airplay] - implemented photo asset cache
[airplay] - always send a content-length header in http answers - even if content length is 0
[airplay] - send an error code for the fp-setup request
[airplay] - change airplay announcements to the reported best working
[airplay] - add some handy helpers for using binary plists
[airplay] - handle /play of newer airplay protocols - instead of location it sends 2 seperate entries host + path
[airplay] - handle /action with "playlistRemove" which is send by newest youtube.app when swiping a video away
[airplay] - split the features used in the SERVER_INFO request inside the airplay protocol from the features announced by bonjour and make them seperate in the xml. They need to stay at 119 else older devices get lots of weired issues!
Merge branch 'ios7airplaytry' of https://github.com/Memphiz/xbmc into nc3-ap