Linux: Gui Settings for HW Decoders

Add Settings to Expert Menu to make it easy for a user to disable certain codecs.

VAAPI:
VC1 interlaced is heavily broken. The driver crashes when doing an assert. A new driver might fix that, but currently it's wip.
Mpeg-2 has for some videos green artifacts.
Mpeg-4 was handled as advanced setting before.

VDPAU:
Radeon OSS with <= HD5xxx has a driver bug when doing mpeg-2 decoding -> segfault in radeon_dri.so. New drivers might fix that issue, but problem still exists.
Mpeg4 was handled via advancedsettings.xml before

Changes:
VAAPI: Disable VC1 by default
VDPAU: nothing