Created a new prototype to unify all the 'basic physical collision behavior' amongst all of our enemies that can possibly be moved, since this has ended up getting duplicated (sometimes inconsistently) amongst ants, fliers, fumpers et al; this will be a counterpoint to stationary-vulnerable.  Stationary-vulnerable should no longer be used for some plants like the basic shooting-plant which are possible to move; it should strictly be reserved for objects which have no feet and never ever move under any circumstances.