options: expose string list actions for --sub-file option

This means you can use --sub-file-set=a,b,c to set a string list
separated by ',', while --sub-file=filename,with,commas.srt still works
(the original motivation for changing the --sub-file option this way).

You can also use it to append strings to string list options without the
need for escale, e.g.: --opengl-shaders-add-str=unescapesdfilename.glsl

(The normal -add for some reason expects a ',' separated list as
argument.)

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