RenderersSettings: Turn off VSync by default.

VSync has issues playing some files and has limited effect in a typical usage scenario.

Fixes #2947.
External filters page: Show the path of the filter using tooltips.
DVBChannel: Remove an unused function.

This function doesn't really have any good reason to exist.
Updated Korean translation

Refs: #1526
Cosmetic: Fix a typo.
update ffmpeg (n0.8-19710-g35135a3)
Remove custom code needed in the past in order to successfully link ffmpeg library.
update h264_recov.c for the recent changes
Update our files for the recent FFmpeg changes.
H264 DXVA Decoder: Rewrote h264_dxva.c based on recent h264.c.
h264_dxva.c: update for the recent changes in ffmpeg
update CFLAGS and ffmpeg/config.asm and ffmpeg/config.h
update ffmpeg (n0.8-19977-gfe898a0)