Hamster cage improvements

[ReynoldsCahoon]

Currently it's very difficult to know which hamster belongs to which cage and which tube is an entrance or an exit.

A possible solution to resolve color confusion could be to replace the tube textures with the previous transparent texture, and tint it to match the color of the hamster that it belongs to.

As for tube direction clarity:

• One of our artists could create a decal (like the ones placed around the tables/objects) of a piece of masking tape with an arrow drawn on it in Sharpie that could be placed on the entrance and exit tubes to indicate travel direction.
• Or we could make it a single tube, that is bidirectional.

[ReynoldsCahoon]

Another task of this issue should be to remove the visible spline paths from the tubes.