[DVDDemux] Allow for larger difference in dts and pts of packet

If video does not start on an I frame, you can get a significant difference
in pts and dts values for the first frame. I've got two videos where they
differ by more than 0.1s.

In this case, we end up setting pts=0 and leaving dts alone (which may be minutes away).
This gets through to GPU on Pi, and it tends to stall waiting for this difference to elapse.

I'm not sure what the largest difference can be, but 0.5s feels completely safe.
I'm not sure of any problems increasing this will cause.
DVDAudioCodecFFmpeg: do not reopen the resample context for each frame.

There is no point in doing this and opening an already opened context
leaks memory in lavr.
configure, external ffmpeg: do not check if libavcodec contains vdpau functions.

it will fall back to other methods if not present and we have no guarantee that the libavcodec version we build against will be the same we run with (except it has the same ABI but ff_vdpau symbols are not part of the ABI).
[jenkins] - disable the need of signing for ios/atv2 on jenkins
Merge pull request #2873 from aballier/resampler_fix

[Fix] DVDAudioCodecFFmpeg: do not reopen the resample context for each frame.
Merge pull request #2874 from aballier/vdpau_check

configure, external ffmpeg: do not check if libavcodec contains vdpau fu...
Merge pull request #2870 from popcornmix/pts_dts_adjust

[DVDDemux] Allow for larger difference in dts and pts of packet
oops... forgot to bump the version in addons/xbmc.pvr/addon.xml
[cosmetic] Fix variable name to match name declared in header and parent constructor
[rbp/omxplayer] do not reopen the resample context for each frame.

I think this doesn't tend to happen on Pi now, as AV_SAMPLE_FMT_S16 and AV_SAMPLE_FMT_FLTP bypass the resampler,
but best to fix it if some obscure codec returns something else.

See #2873
Merge pull request #2881 from popcornmix/avoid_resample_init

[rbp/omxplayer] do not reopen the resample context for each frame.
Added CFileItem::FillInMimeType() and make GetMimeType() respect const qualifiers.

Before, the MIME type would only be resolved if GetMimeType(true) was called, which is potentially blocking. Now MIME types will be resolved from the file's extension without possibly blocking the thread. See doxy of CFileItem::FillInMimeType() for more info.
Revert "Merge pull request #2809 from jmarshallnz/no_skip_for_you"

This reverts commit c5a85f72b6f685be832d4e3a43328de49baabf03, reversing
changes made to e9aed1d645158647aa2006ac4b2d2d18a3d1ecbf.
Only allow prev-next chapter jumps outside of active playlist
Move player action handling out of GUIDialogVideoOSD and GUIWindowFullScreen into Application
Merge pull request #2855 from Voyager1/skip-chapters-withoutplaylist

Re-enable skip previous/next as chapter jumps, when outside of playlist context
[fix][ios] ping ; timeout option not supported
Merge pull request #2887 from t4-ravenbird/ios-ping

[fix][ios] ping ; timeout option not supported
[FreeBSD] ping use -t for timeout like OSX
[mingw] added pkg-config to fix configure finding not all available libs