Some very long overdue balance tweaks

Small fix to improve future mod compatibility. Gameplay unaffected.

Bugfix, small code improvements, and a new look for the Fanatic Plasma Rifle!

Clarifying the execution function of the Fanatic Inquisitor in the in game ability description: The executed soldier will not bleed out or sustain.

Mutons from AHW: Advanced Aliens can now spawn as followers of the Fanatics.

Fanatics can now spawn in a slightly large number of varying pod combinations.

Fanatics should now always properly display reveal animations like other enemies.

Fanatic Crusader AI improvements.