enableSelfCollision has a misleading argument

[mkoval]

enableSelfCollision takes a _enableAdjacentBodyCheck boolean argument. This leads to the unintuitive behavior that this line actually enables self-collision checking:

skeleton->enableSelfCollision(false);

It also leads to a strange asymmetry, where there is no way to change the value of isEnabledAdjacentBodyCheck without also enabling self-collision detection. I suggest deprecating enableSelfCollision and replacing it with two separate functions: one for enabling/disabling self collision checks and one for enabling/disabling adjacent body checks.

[jslee02]

Resolved by #718