Empty RBSong Generation

[maxton]

RBSong has all the venue animation information in it (and in newer songs it also has lipsync data embedded, like the milo file used to have). I think we can skip the lipsync embedding and just use external lipsync files, but we need at the very least to be able to generate an “empty” rbsong template with no animations, and work from there.

This might require more reverse engineering work as I don’t believe the current RBSong structure is completely correct.

[maxton]

Considering this done in spite of not knowing why some strings have null terminators. It's just hard coded for now.