Fix most instances of #27 by replacing 3ds models with collada ones.

These work (for me at least) with both 97.0.1-189 and 91.0, using same type of hack as used for Gauss.

Hunter and Reef retain the 3ds model because i failed to import them in a way that wouldn't require manually editing the model geometry (at which point it'd be smarter to just replace them completely).