Adds benchmarks on a "SplitTree" collision tree type.
Adds benchmarks on a "SplitTree" collision tree type.

Better performance can be reached in systems with a high number of static elements and a low number of dynamic elements by using a separate collision tree for each set and combining the results, in theory, and we probably want to have a type that is parallel to collision.Tree that allows this.

oakmound/oak,oakmound/oak,oakmound/oak