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Improve the ASS format subtitling feature support, mostly those supported by libass. [ASS File Format Guide by libass](https://github.com/libass/libass/wiki/ASS-File-Format-Guide) - [x] Load & Save fontSection in the ASS format subtitle - [x] Better store & manage the ASS format subtitle event by adding the SubtitleEvent class. - [x] Improve the subtitle saving method to save all information in ASS Format Files. - [x] Migration from V4Style to V4+Style - [x] Display subtitle clips from different layers as more subtitle tracks (WIP) - [x] Read & Edit with the comment event - [x] Add layer management in "Subtitle Manager" widget - [x] A new "Manage Subtitle Style" widget for add/delete/copy styles in the subtitle files - [x] Improve the existing subtitle editor - [x] Set different default styles for each subtitle track - [x] Fix bugs related to undo/redo, clean up code This is a part of Google Summer of Code 2024 project: [Improved subtitling support](https://su...
