upnp: ask if user wishes to stop playback on remote device on stop

This allow user to detach from a remote upnp player without
stopping playback.
upnp: split attach and play function in player

This avoids delay when attaching to stopped player.
upnp: reindent after previous commit
AESinkPULSE: Take care when using m_encodedRate when doing passthrough fallback to m_sampleRate
ActiveAE: Set m_encodedRate when doing transcoding
AESinkPULSE: Fix default device (again)
dvdplayer: fix audio codec ffmpeg, set buffer size correctly
Merge pull request #4045 from fritsch/pulseaudio-pr

AESinkPULSE: Be careful when using m_encodedRate fallback to sampleRate instead (fixes stereo upmix with pulse)
Merge pull request #4047 from FernetMenta/aefixes

dvdplayer: fix audio codec ffmpeg, set buffer size correctly
Merge pull request #4020 from elupus/upnpplayer

UPnP player disconnect/attach improvements
FIX: [droid] prevent the os from shutting us down if a touchpad device is added/removed
Merge pull request #4053 from koying/quickpr

FIX: [droid] prevent the os from shutting us down if a touchpad device i...
AE: add settings to enable ac3 transcode and upmix via ac3 transcoding
ActiveAE: implement settings for ac3 transcode and upmix
AE: rename setting speaker configuration
Merge pull request #4025 from FernetMenta/audiopage

AE: add settings for ac3 transcode and ac3 upmix
fixed: Only force cache for video else it may cause a thread-storm
Merge pull request #4027 from arnova/file_cache_not_for_all_fix

fixed: Only force cache for video else it may cause a thread-storm
changed: Enable multicache for mkv files (fixes #13841)
changed: We should always check for multistream when caching