Confirm the interpretation of unused RSM animation types

[rdw-software]

Empirically, only two values appear to be used in the kRO client: 0 and 2 (no looping/loop from the start)

Various sources indicate possible interpretations of the other values, but I'm not sure if those were ever verified. It would be easy to manipulate the data to check whether the client actually supports rendering models that use those modes. It would also be interesting to check whether they're used in Arcturus.

I might've done this already, but I don't remember, so maybe dig up the old research notes and review them.