Weapon & Activity Script Fixes

[jacenhan]

Actually just two updates to fix things that bothered me when I was checking out the nightly build.

1. Bunker Breach now correctly spawns in door actors. More accurately, it no longer deletes door actors, which it looks like it started doing because the actors themselves don't have the "Bunker Systems" group anymore. Not sure when that happened or how/if it should be fixed, but it looks like this is the only place that that check was being made, so I just added an IsADoor check and it works now.
2. Auto-targeting weapons (ML-02 Flash, Nucleo Swarm, Coalition Missile Launcher, Dropship turrets) no longer target actors with GetsHitByMOs set to false. This mainly affects mods that use "invisible" actors, like my Endless War/Breach mods, so this is a bit of a selfish one.

[Causeless]

nice!