Clarify collision detection functions
Clarify collision detection functions

The canCollide function did more than it needed to by doing an equality
check in addition to a range check. It has been simplified into just a
range check, and overall the collision detection functions have been
clarified a bit. This will make future additions more clear.

Signed-off-by: Zac Delventhal <593147d2808cd66b7e2ad59ca4b0c07d6c52cddd@gmail.com>

meeba-farm/meeba-farm,meeba-farm/meeba-farm