Add support for SSA subtitles

[pstopkin]

Hi,

I've customized scripts for ssa/ass-files loading and simple time-overlapped text stacking. I hope, updated scripts (getsubtitles.js and checksubtitles.js) will be useful. It was tested on SailfishOS 2.1.2.3, Inoi R7 phone.

What's added:

• select available subtitles file from the list: .srt, .ssa, *.ass;
• parse SubStation Alpha subtitles, text only, without styles;
• quick search and stacking current subtitles by time.

helper.tar.gz

[llelectronics]

Wonderful. Thank you very much for your contribution.