Option to name output file like the srt file

[prototyperspective]

I'm using this tool to create podcast-like spoken Wikipedia audio files (mainly here) and it would be very useful if there was a way to have the output file named like the input srt file. So if the input is "Bhutanese passport.srt" the output file should be named "Bhutanese passport.mp3" – will put that in a separate issue. It would probably not be difficult to implement, e.g. there could be a checkbox for "Name output like srt file" if an srt file has been specified. This would be used in combination with #118 to create many audios in a row.