[bluray] Revise debug log messages.
[ios7] - fix autorotation of external touchscreen controller (when using tvout) on ios7 (by implementing the needed bits of the new orientation/rotation API as the old one vanished in ios7 runtime)
[musicdb] songs with extensions that weren't lower-case couldn't be played. fixes #14879
Merge pull request #4093 from ace20022/blu_log

[bluray] Revise debug log messages.
[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
use fmpeg master branch because 2.1 is broken
1 place to define the ffmpeg version to download is enough