Ffsubsync

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* Add Chinese to the list of encodings that can be inferred;
* Make srt parsing more robust;

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* Misc bugfixes;
* Proper logging;
* Proper version handling;

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* Support srt format;
* Support using srt as reference;
* Support using video as reference (via ffmpeg);
* Support writing to stdout or file (read from stdin not yet supported; can only read from file);