[PiSink] Dual audio support

The Pi supports dual audio in omxplayer, where the gpu outputs audio to
both hdmi and analogue connections.

With dvdplayer being more usable on Pi now, there are frequent requests
for this functionality through the Pi Sink.

This removes the gui setting for "dual audio" and creates a new sink
output for dual audio. It add support to the Pi sink and makes omxplayer
use the new setting.
Merge pull request #5526 from xhaggi/pvr-fix-continue-last-channel

[pvr] fix continue playback of last watched channel on startup if group was deleted or channel was moved
Merge pull request #5547 from xhaggi/pvr-fix-context-menu

[pvr] fix call to base class GetContextButtons() to re-add favorite entry
CHG: [droid] refactor packaging to allow obb google extension apk
Merge pull request #5490 from xhaggi/fix-built-in-activatewindow

[builtin] fix activatewindow if directory path differs
Add some new weather strings
Merge pull request #5390 from Memphiz/iphone6

[ios] - support iphone6plus screensize which uses screenScale 3
Merge pull request #5554 from popcornmix/edl_flush

[omxplayer] Restore flush/accurate seek flags to fix issue with edl skip
Merge pull request #5557 from popcornmix/pisink_audio

[PiSink] Dual audio support
runscript: make sure to get the correct extension point to run
vaapi: glIsSync, glIsTexture seem to unreliable on Intel
[ios] - fix devcert signing (pvr addons were missing and couldn't be loaded)
Merge pull request #5551 from FernetMenta/vaapifix

vaapi: workaround intel bugs
[Confluence] Update weather window
Fix LOGDBUS component logging.
[buildsystem] posix: add legacy xbmc links for libdir, includedir and datarootdir

fixes legacy xbmc binary addons, e.g. pvr
[videoinfoscanner] do not log username/password
[subtitles] do not log username/password
[playlistplayer] do not log username/password
[streamdetails] do not log username/password