Revert "paplayer: use position based seeks for ffmpeg demuxer"

This reverts commit fdcb40a9c2817d87a661a7cb7d72808e0f09ffed.
paplayer: rewind stream after init (ffmpeg codec)
Merge pull request #4500 from FernetMenta/aefixes

Revert "paplayer: use position based seeks for ffmpeg demuxer"
settings: fix detection of value changes in CSettingList
[webui] Add keyboard controls to web remote
Merge pull request #4508 from Montellese/settinglist_default_fix

settings: fix detection of value changes in CSettingList
Merge pull request #4494 from davidbanham/master

Add keyboard controls to web remote
Merge pull request #4504 from FernetMenta/paplayer

paplayer: rewind stream after init (ffmpeg codec)
[depends] move ffmpeg to unified deps
[configure] remove internal ffmpeg
remove ffmpeg from tree
ffmpeg: remove dll wrappers
add ffmpeg lock manager
todo: refactor to own file
ffmpeg: move callbacks into separate file
remove ffmpeg dlls from generated headers
not removing win32 as this might still be needed?
sq to configure - add --with-ffmpeg=force option
this will always build our ffmpeg version, even if its found in system
only enable auto building ffmpeg if we are not cross compiling
[rpi] setup-sdk.sh: allow overriding of buildroot and xbmc install paths
also don't require root if not needed
sq to configure - fixup after upstream rebase
add ffmpeg makefile for rpi