change the way 4K resolution is determined.

Older versions of
tvheadend incorrectly report 1080i channels as having 1088 vertical
pixels so they got classified as 4K. The algorithm is now changed
to consider source as 4K only when the total pixel count exceeds
6 megapixels.
dvdplayer: use startpts as a time reference if no other is available

This avoids display of wrong time after seek, due to lack of timestamps
dvdplayer: remove code that set limit on smallest frame rate

This skips the "slow" motion video after seek, by instead starting
playback when next frame is to be displayed
dvdplayer: always output the first frame after seek/startup without wait

This make sure we get something new on display after seek, even if
the next frame is to be displayed sometime later
dvdplayer: avoid busy waiting for video renderers to get a buffer
coreae: when a flush is requested delay is zero

On seek, the flush was requested, but not performed when delay
was requested, leading to stuttering on seek.
allow remote access to "special://skin" directory
allow remote access to "special://profile/addon_data" directory
FIX: [depends]: boost: actually enable spinlock for shared_ptr multithread on arm
[WIN32] fixed: exit on build failure with pvr addons
Merge pull request #4010 from wsoltys/buildsys3

[WIN32] fixed: exit on build failure with pvr addons
[WIN32] fixed typo.
Remove unused xbox string

This strings is linked to

#: xbmc/video/dialogs/GUIDialogVideoSettings.cpp

Since it doesnt exist there it must have been removed at an earlier
date.
Merge pull request #4062 from koying/fixdependsboost

FIX: [depends]: boost: actually enable spinlock for shared_ptr multithread on arm
fixed: We should't try to xml load favourites:// paths
fixed: Cosmetics
[PVR][Language] use "icon" for all channel icon related settings and dialogs instead of "thumbnail"
Merge pull request #4059 from arnova/favourites_fix

fixed: We should't try to xml load favourites:// paths
Merge pull request #4069 from uNiversaI/xbox

Remove unused xbox string
[scrapers] Replace Buffers before parsing XSLT nodes