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module. It has almost no code in common with normal subtitles and ASS
subtitle decoding, and this split further simplifies what belongs to
what.

Subsdec: Split the decoder for subsdec / SSA / USF in three files, since the code has grown a bit too much in order to improve readability.
Some functions may still need to be renamed and moved from a file to another.
I hope it is done in the correct way, if not, tell me or revert.