Added armor defines
Converted raw strings use to defines
Added UT test to ensure people set the armor var correctly (to a list)
No player facing changes
Refactored the projectile code, mostly in line with TG's now.
Refactored various procs that are used or depends on it.
Projectiles can now ricochet if enabled to.
Damage falloffs with distance.
Homing projectiles can now have accuracy falloff with distance.
Projectiles have a maximum range.
Muzzle flash is configurable per projectile.
Impact effect of the projectile is configurable per projectile.
Accuracy decreases with distance.
Projectiles work with signals and emits them, for easy hooking up from
other parts of the code.
Meatshielding is now less effective .
Impact sound is now configurable per projectile.
High risk.
Resolves#597
rscadd: "Non-wizards using wizard items may experience fun stuff."
tweak: "Mental focus damage level's have returned to old-code, to better compete with Mutate."
bugfix: "Mental focus staff has had its area of effect mode returned."
Removes can_fire() and moves some of it's functionality into
get_next_projectile(), which was renamed to consume_next_projectile() to
indicate the possibility of side-effects.
Also renamed flag var to check_armour
