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Applies formatting changes, fixes VTT output #36
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Applies the .editorconfig auto-formatter updates now that all existing Pull Requests and tasks have been resolved. This was done done using Pycharm: for each Python file, add character, save (which applies the .editorconfig automatically), then delete the added character and save again. Ref abhirooptalasila#30
Applies the Jetbrain Pycharm feature of autoformatting whitespace now that all existing PR's have been merged. Ref abhirooptalasila#30
Uses Pycharm to remove unused imports (and re-order existing ones), which can be cleanly applied now that all existing PR's have been merged. Ref abhirooptalasila#30
The VTT file format has being incorrectly generated for at least a few months, but more likely since the feature was first added. This commit: * Removes the duplication (double the subtitles) due to the code first writing a line without the cue data, then the line with the cue data. The line without the cue data is not required. * Fixes the number of milliseconds digits to always be 3 instead of the 0 or 5 digits that the str(timedelta) function otherwise provides. * Outputs VTT subtitles that are much closer to the YouTube autogenerated subtitle cue timings. Testing the actual cue timings is difficult: very few video players appear to process the cue timings. VLC does not appear to. On subtitles downloaded from YouTube sometimes it looks like it does, but it's actually a separate subtitle being displayed where the content moved from the second line to the first line. But this commit at least makes the VTT output match subtitles downloaded from YouTube much more closely.
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Now that all existing PR's have been merged, I have applied the codebase formatting changes on top based on the editorconfig stuff, and tidied things up a bit.
Also I noticed the VTT subtitle format has always been broken (see commit message) so I've fixed that up too.