1.0
First version ! Initial features :
- importing a text file
- reading existing SRT
- saving to SRT
- opening an associated video
- add/edit/move/remove a line
- update a line's timings when using an associated video
- remove gaps by matching a line's end time to the next line's start time
- undo/redo
- showing the subtitle preview while playing the associated video
- select a playback speed for the associated video