configure.in: enable FFMPEG static build for ARM, some cleanups. Tested on i686, x86_64, arm (RPi & Cubox-i).
[epg] don't use epg tag that was active as a currently active one if epg contains gaps
AESinkPULSE: Let Engine handle our volume
[addons] don't group add-ons into categories in disabled and available update sections of the add-on maanger
[addons] allow GetAllOutdatedAddons to return the local addon versions - useful for scheduling updates
[busydialog] factor out the dvdplayer busy dialog waiting so as to use it for other things
[addons] add 'Update all' item to the available updates menu
[addons] notifying the user once during repo updates is enough
[gl] support YUV420P10->RGB in software renderer
[WIN32] remove harfbuzz library as its already compiled within our "internal" libass (see https://github.com/xbmc/libass)
Merge pull request #4263 from jmarshallnz/soft10bit

[gl] support YUV420P10->RGB in software renderer
Merge pull request #4270 from MartijnKaijser/addondisabled

[language] split of "Add-on disabled" string after d688682
[language] fix string id after abc59871c18294e8fd499c29290a381b76841c0c
Merge pull request #4269 from wsoltys/cleanup

[WIN32] remove harfbuzz library
Merge pull request #4260 from jmarshallnz/addon_improvements

Addon improvements
Merge pull request #4154 from sraue/ffmpeg-static-fixes

configure.in: enable FFMPEG static build for ARM, some cleanups. Tested ...
dvdplayer: [fix] subtitle priority for multiple...

external subtitles
omxplayer: [fix] subtitle priority for multiple external subtitles
Merge pull request #4251 from ThiasDE/extsub_priority

dvdplayer: [fix] subtitle priority for multiple external subtitles
[subsCore] close search window if playback is stopped