bump to Gotham 13.1 beta2
deinitialize CAnnouncementManager before stopping all (network) services

partial backport of e2693c5cb5320cede4d4dd884059c4574366eef1 and b348974a3fd13d3bd6d02e308037b0862f4c8ea0.
Re-factored FileItem to support IsResumePointSet() and GetCurrentResumeTime()
Re-factored FileItem to retrieve fresh resume data for recordings from the PVR server
Re-factored GetResumeString to not insert a bookmark in the video db, it is never used
Merge pull request #4630 from Red-F/gotham-resume-pvr-lastplayedposition

FIX resume playing PVR recordings from the exact lastplayed position
Merge pull request #4695 from Memphiz/badaccess

[airplay] - fix possible bad access as reported in
[upnp] properly hide the addons node
Merge pull request #4730 from Montellese/gotham_announcement_fix

deinitialize CAnnouncementManager before stopping all (network) services
Merge pull request #4700 from MartijnKaijser/13.1b2

13.1b2
[DualAudio] Update README info
[DualAudio] make Audio Engine Interfaces support 2nd audio
[DualAudio] make Audio Engine Utilities support 2nd audio
[DualAudio] make Audio Engine ffmpeg encoder support 2nd audio
[DualAudio] implement ActiveAE code for 2nd audio
[DualAudio] create 2nd Audio Engine instance for AEFactory
[DualAudio] add detection of NULL audio sink for failsafe
[DualAudio] add 2nd audio settings to xml configuration
[DualAudio] implement code of 2nd audio for GUI settings
[DualAudio] implement 2nd output of GUI sounds