Subs2cia

Fixed
- `-m` was raising an error due to an improper refactor

Added
- Can now ignore chapters `-Ic` in addition to time ranges (`-I`)
- `-ls` now also lists chapter start/end times and titles for use with `-Ic`

Added
- Export subtitles, audio, screenshots for use in a SRS application
- Ignore ranges can now be specified relative to end of audio (using `e` prefix) and to start of ignore range
(using `+` prefix)
- Examples:
- Ignore two minutes minute after 10 minute mark: `-I 10m +2m`
- Ignore last minute: `-I e1m +1m` or `-I e1m e0m`
- Ignore 1m30s after 2 minute mark: `-I 2m +1m30s`
- Interactive mode for selecting audio/subtitle/video streams as alternative to current automatic picker system
- Bitrate, mono-channel output controls
Fixed
- Fix infinite loop that occurred when ignore range exactly matched subtitle start/end
- Fix issue where files were not correctly grouped
- Picker now accounts for input file order when choosing streams

Added
- Ignore ranges option for ignoring subtitles that lie in a certain time range for OP/ED removal

Added
- Subtitles are now also condensed alongside audio and/or video
- Condensed videos now come with condensed subtitles muxed in
- Check to see if ffmpeg is in path, raises warning in the log if it's not found
- PyPi package!
Fixed
- Fix pycountry exception occuring when looking up Stream language
Depreciated
- subtools.py: `load_subtitles()` and `merge_times()` have been deprecated in favor of SubtitleManipulator and SubGroup

<!-- Added, Changed, Depreciated, Removed, Fixed, Security -->