[mythtv] [experimental patch] vbi decoder for IVTV cards

[Martin Barnasconi]

Update of some files to support the following
- standard teletext graphics
- (black) background color(s) enabled by default
- use 'W' key to toggle between transparent and black background

As I am not sync-ed to the latest CVS, just overwrite the existing files with 
the ones in the tar.gz (as these files does not exist in the CVS tree).

I've seen a DVB derived experimental patch. Guess you can just do a diff and 
add use this for DVB as well. Sooner or later I will add a DVB portion to my 
code.

still TODO:
- missing subtitle packets in embedded MPEG PS file
- up/down goes wrong when out-of-decimal range
- FLOF/color keys 
- TXT in menu should enable teletext 
- CC in menu should enable CC/subtitles
- scale with TV screen/image size
- split screen

Martin
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