modules/rkt: begin til_audio integrations

- til_audio_seek() when Rocket sets the row
- til_audio_{pause,unpause}() when Rocket (un)pauses

This is of limited use as-is, rkt probably needs a sister concept
of scenes for songs, which similarly to scenes would be selected
by index in a discrete Rocket track.

As-is to make music work one must always incorporate something
like a modules/playit context into the current scene so it always
gets rendered alongside the visuals.  That's quite cumbersome and
annoying.

Another possibility would be introducing something like a
"register" built-in that, like "ref", takes a context path, and
maybe something like a pre/post setting.  That would put it in
the rendering path of the stream before or after any explicit
renders...  Then all one would need is to register a
modules/playit context with the song of interest to have it play,
and create that as any other rkt "scene", and reference its
context from "register" which could bind a tap for controlling
the registered/unregistered state.  It needs more fleshing out,
but what's here seems worth merging as-is for now.

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