Support other subtitle formats like VobSub

[rvbg]

Your program works exceptionally well, so I hope to be able to use it with VobSubs as well.

A flag could perhaps include VobSubs too and convert them to PGS with something like TheGreatMcPain/BDSup2SubPlusPlus.

Perhaps plain VobSub text recognition with Tesseract is not good enough and needs additional post-processing.

I'll try to automate the whole thing with your API and hope the results are reasonably okay.