fix subtitle positions

FIX: [droid] proper audio focus management

changed: Properly exit screensaver on shutdown (fixes #16028)

ADD: [droid] standard refreshrate switcher (>= api 21)

[xbmc][nfo] Fix garbage in being added in streamdetails

[players] Fix for SetPriority calls being ignored

make sure that we don't set values when there was no node, we have no idea what will be in value if that happens. closes #16040

Added a convenience method to XMLUtils for easier string handling

Added return value checks VideoInfoTag::ParseNative as it gets called with partial xml files and
not checking the return value clears all fields not in that partial xml

Documented GetString methods in XMLUtils

renderer: fix mixed-up rd/rv after fd53c703, resulted in wrong subtitle positions

All credit to @anssih

[android] hide certain settings which are non functional

[pvr] bump addons

When running top -H you should be able to see the priority
(niceness) of kodi threads. ActiveAESink has a niceness of -1.
(assuming OS perimissions allow that either by running as root or
through /etc/security/limits.conf)

DVDPlayerAudio should have a niceness of -1 but does not.
This is down to overloading of the SetPriority functions
we currently end up with the dummy version.

The view was that changing priority of player threads is not
useful so I've removed the calls. As it is not currently working
this should be harmless.

dvdplayer: do not signal started until output of first frame

[seek] fix: reset seek size after seeking

[epg] Remove usage of 'using namespace std'

[epg] Sort included files alphabetical

Followup fix for CID1272226

[pvr] Remove not needed trailing spaces

Fix Coverity #1272226 Remove 'const' keyword from implementation

[database][mysql] insert char set for CREATE TABLE .. SELECT syntax between create table and select clause

[binary addons] bump audio decoders

Fixes CID 1272226