Frozen Mutation (MakeInfantry) Animations

Infantry killed by a mutation warhead appear to transform into another InfantryType. Internally this is achieved by playing an animation, upon completion of which a new infantry unit is spawned. If the cell where the new infantry is to be spawned is already occupied then the animation will pause on the final frame until the obstacle is cleared.

The original game would allocate memory for the new infantry on every frame but would fail to de-allocate that memory when the infantry could not be placed. The more time that passes with the animation in this state, the worse the memory leak gets -- resulting in the game eventually grinding to a halt. Ares fixes this by simply deleting the animation if the new infantry unit cannot be spawned.

Added in version 0.1.