Patched to (hopefully) fix an issue where the Chosen could sometimes break a Siege Mission and not cause enemies (or civilians in some cases) to not spawn properly.

Small UI objective text update.

Fixed an issue that could cause enemy spawns to fail during Siege Missions on rare occasions.

Fixing an issue causing Siege: Haven Massacre missions to incorrectly display which objective had been completed.

Improved Siege: Avenger Assault force level scaling

Added a couple of militia as bullet sponges.