Refactor handling of hit radii in projectiles.

penev discovered that the RulesetLoaded functions of projectiles were
never being called, meaning that their blocking calculations were not
properly accounting for actors with large hitboxes.

The best fix for this is to change FindActorsOnLine to always account
for the largest actor's hit radius, rather than forcing callers to pass
the largest radius. Per the comment in Util.cs, as a result, move this
computation to ActorMap. I decided to simplify by not making a separate
calculation for actors that block projectiles only; this may cause a
small performance degradation as the search space is a bit larger.

Similarly to this, I've removed the ability to specify a search radius
manually. Because this is only a search radius, setting a value smaller
than the largest eligible actor makes no sense; that would lead to
completely inconsistent blocking. Setting a larger value, on the other
hand, would make no difference.

CreateEffectWarhead was the only place in core code any of these search
radii were set, and that's because 0 was a mysterious magic value that
made the warhead incapable of hitting actors. I replaced it with a
boolean flag that more clearly indicates the actual behaviour.

Fixes #14151.

mods/cnc/weapons/ballistics.yaml

@@ -21,7 +21,7 @@
 	Warhead@3Eff: CreateEffect
 		Explosions: small_frag
 		ImpactSounds: xplos.aud
-		VictimScanRadius: 0
+		ImpactActors: false
 
 70mm:
 	Inherits: ^BallisticWeapon

mods/cnc/weapons/explosions.yaml

@@ -11,7 +11,7 @@
 	Warhead@2Eff: CreateEffect
 		Explosions: poof
 		ImpactSounds: xplos.aud
-		VictimScanRadius: 0
+		ImpactActors: false
 	Warhead@3Smu: LeaveSmudge
 		SmudgeType: Crater
 		InvalidTargets: Vehicle, Structure, Wall, Husk, Trees, Creep
@@ -92,7 +92,7 @@ BuildingExplode:
 	Warhead@1Eff: CreateEffect
 		Explosions: building, building_napalm, med_frag, poof, small_building
 		Delay: 1
-		VictimScanRadius: 0
+		ImpactActors: false
 	Warhead@2Smu: LeaveSmudge
 		SmudgeType: Crater
 		Delay: 1

mods/cnc/weapons/missiles.yaml

@@ -31,7 +31,7 @@
 	Warhead@3Eff: CreateEffect
 		Explosions: small_frag
 		ImpactSounds: xplos.aud
-		VictimScanRadius: 0
+		ImpactActors: false
 		ValidTargets: Ground, Water, Air
 
 Dragon:
@@ -130,7 +130,7 @@ MammothMissiles:
 	Warhead@4EffAir: CreateEffect
 		Explosions: small_building
 		ImpactSounds: xplos.aud
-		VictimScanRadius: 0
+		ImpactActors: false
 		ValidTargets: Air
 
 227mm:
@@ -208,7 +208,7 @@ BoatMissile:
 	Warhead@4EffAir: CreateEffect
 		Explosions: small_building
 		ImpactSounds: xplos.aud
-		VictimScanRadius: 0
+		ImpactActors: false
 		ValidTargets: Air
 
 TowerMissile:

mods/cnc/weapons/other.yaml

@@ -23,7 +23,7 @@
 	Warhead@3Eff: CreateEffect
 		Explosions: small_napalm
 		ImpactSounds: flamer2.aud
-		VictimScanRadius: 0
+		ImpactActors: false
 
 Flamethrower:
 	Inherits: ^FlameWeapon
@@ -144,4 +144,4 @@ Demolish:
 	Warhead@2Eff: CreateEffect
 		Explosions: building
 		ImpactSounds: xplobig6.aud
-		VictimScanRadius: 0
+		ImpactActors: false

mods/cnc/weapons/smallcaliber.yaml

@@ -29,7 +29,7 @@ Sniper:
 		DamageTypes: Prone50Percent, TriggerProne, BulletDeath
 	Warhead@2Eff: CreateEffect
 		Explosions: piffs
-		VictimScanRadius: 0
+		ImpactActors: false
 		ValidTargets: Ground, Water, Air
 
 HighV:

mods/cnc/weapons/superweapons.yaml

@@ -16,7 +16,7 @@ Atomic:
 	Warhead@2Eff_impact: CreateEffect
 		Explosions: nuke_explosion
 		ImpactSounds: nukexplo.aud
-		VictimScanRadius: 0
+		ImpactActors: false
 	Warhead@3Dam_areanukea: SpreadDamage
 		Spread: 2c512
 		Damage: 11000
@@ -41,7 +41,7 @@ Atomic:
 	Warhead@6Eff_areanukea: CreateEffect
 		ImpactSounds: xplobig4.aud
 		Delay: 3
-		VictimScanRadius: 0
+		ImpactActors: false
 	Warhead@7Dam_areanukeb: SpreadDamage
 		Spread: 3c768
 		Damage: 5000