[mythtv] SSA/ASS sub support(with patches)

[Shawn King]

FFMPEG has now gotten ASS/SSA sub decoders is there any plans on adding 
support?

attached is some patches that i have been using for a few days now w/out 
issues it doesnt support any SSA override codes but most other stuff is 
in there(myth-03-SubtitleScreenSSASubSupport.patch is very wip atm)

the ffmpeg-* patches is the backported ASS/SSA subtitle code with 1 
bugfix(ASS dialog line wasn't null terminated not sure if FFMPEG guys 
know about it yet)
myth-01-AVFormatFontSupport.patch adds support for loading embedded 
fonts into mythtv's fontmanager for use in the subs
myth-02-AVFormatSubtitleHeaderSupport.patch adds support for getting the 
subtitle headers
and myth-03-SubtitleScreenSSASubSupport.patch adds all the code for 
displaying the subs and is quite messy(and prob wrong at parts)

it isnt good enough to be considered for commiting i know but it is a start
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