* Allow to set the gap between subtitles, to be used when inserting or splitting subtitles
* Fixed character count when editing text
* Multiple subtitle engine fixes:
* Fixed parsing and writing (AQTitle, Karaoke Lyrics LRC, MacSUB, MPSub, Panimator,
Phoenix Japanimation Society, Sofni, SubCreator 1.x, ViPlay Subtitle File)
* Fixed output of deciseconds (SubCreator 1.x)
* Removed extra newline in the output (MacSUB, Phoenix Japanimation Society, Panimator)
* Fixed bug with multiple lines of text per subtitle (Sofni)
* Switched to GStreamer 1.0
* Fixed Help menu items
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