CharacterFollowController needs work

[richardolsson]

The CharacterFollowController needs some work. First, it is not specific to characters, so should be renamed. Second, there seems to be some uncertainty to what it should actually be doing. One would expect it to always follow behind the target object, but it's currently not. This may be a bug, or may be as designed, in which case this needs to be documented.

I suggest having it always follow the character, but then it might be very similar to SpringController (#328). Consider merging them, or sharing code.