[pvr.mythtv] bump addon to version 2.7.4

[pvr] bump pvr.stalker to 0.8.4

dvdplayer: fix non DVB subs after  5c0d694f

FIX: [droid] use renderer resolution when available

When switching refresh rate, the native window is destroyed and
recreated, so use the rendere resolution if available to avoid being
reset to the setting resolution

- Remove EPG associations with recording due a performance issue

[pydocs] xbmcgui.lock() and xbmcgui.unlock() are depricated and non-f…

Bump pvr.vbox to 1.3.9

[musicdatabase] Fix incompatible MySQL queries (Backport)

[Mirrors][Jenkins] Upload android debug symbols (backport)

[pvr.mythtv] bump addon to version 2.7.3

[pvr] Bump pvr.hts to 2.1.18

bump to 15.2rc3

[fix][gui] Fix multi images in grouplists/layouts.

This fixes a regression introduced with cb2dd229 .

fix c/p error in 1937a0f9

Fix position outside of video for text based subs

FIX: proper casting of file time TZ adjustment

Regression from
https://github.com/xbmc/xbmc/commit/6e0fefdbfd60e5ff0f12e1711df011d8428629ca

[fix][subs] Fix MicroDVD Subtitles after da80dbea…

[Isengard] DXVA rewind fix

[cores] RenderManager::GetStats - now returns queue and discard separately. DVDPlayerVideo - ignore discard stats for dropping frame on rewind.

The main problem is:
1) The DXVA processor allows (and requires for de-interlacing) a set of past frames. This causes the bufferLevel greater than 0.
3) DVDPlayerVideo drops any frame if bufferLevel is greater than 0 on rewind, so the renderer doesn't receive any new frame which causes freezing picture when DXVA processor is used.

This changes behavior DVDPlayerVideo to do not consider the discard queue before dropping frame on rewind.

FIX: [droid;storage] check readability last

Prevents unnecessary I/O and selinux issues