Add missing accelerators to mplayerc.rc

This commit fixes #2199.
Updated Catalan translation.

Refs: #2408.
External filters: Use two separated list for x86 and x64.

x86 filters only work with MPC-HC x86 and vice-versa.
Add some options to give a finer control on subtitles track selection.

The user is now free to choose if MPC-HC must prefer forced/default subtitles tracks (default is on) and if MPC-HC is allowed to change the subtitles track an external splitter selected to be the default (default is off).
Fix duplicated line endings and add the line missing in Japanese and Simplified Chinese translations.
update ffmpeg/config.h
update ffmpeg (n0.8-19508-g454c5d1)

Notes: broken atm because our custom files need to be updated too

* libavcodec/h264_dxva.c
* libavcodec/h264_recov.c
* libavcodec/vc1_dxva.c
n0.8-19525-g393dcbf
remove custom code