[FEAT] Lasers can now kill Zombies (and pop balloons!)

[WillLem]

As of SuperLemmix 2.6, we have the ability to kill zombies and pop balloons using a Laserer's laser beam!

For either, the laser can either directly hit the balloon/zombie, or the balloon/zombie can drift/walk into an already-active laser beam. As with Projectiles, Zombies explode (no destruction crater) and balloons pop, causing the Ballooner lem to fall.

The feature is currently being tested in the RC, and has been implemented in Commit 11cacc831