Ship mast destruction animation

[brian]

Create falling animation for ship masts.

This will allow a slower sink/decay time for ships which in turn will allow them to stay sunken on the bottom longer without looking strange (masts sticking out of the water after the ship has decayed below the ocean floor).

To accomplish this, the masts will need to be extracted from the existing models (the .blends or other uncompressed formats, not the collada / .dae files). An actor will be created for each mast. The masts will be removed from the original ships and replaced with a prop point. The new mast model will be referenced at the prop point.

One falling animation will be created per mast. An addition mast actor will be created that will reference the new falling animation. This actor will be swapped with the regular mast actor when a ship is "killed".