Remember soundtrack and subtitle settings

Audience remembers the video position on exit, which is neat. However, for a truly take-up-where-you-left experience this is not enough. Audience should also remember the user-selected soundtrack and subtitles, as well as any other file-specific preferences.

Launchpad Details: [#LP1046842](https://bugs.launchpad.net/bugs/1046842) Sergey "Shnatsel" Davidoff - 2012-09-06 13:40:33 +0000

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No files, tests, or entry points are named. Start by locating how video position is currently persisted and restored, then trace where soundtrack and subtitle selections are applied; done means those user-selected, file-specific settings are restored when playback resumes.

Written by the indexing model from the issue text.