Add ability for +VVEDIT users to scale damage/healing in the game (#35255)

* Initial commit

* Add universal modifier for all damage/heals, make guidebooks work.

* help text

Content.Server/Projectiles/ProjectileSystem.cs

@@ -44,7 +44,7 @@ public sealed class ProjectileSystem : SharedProjectileSystem
             return;
         }
 
-        var ev = new ProjectileHitEvent(component.Damage, target, component.Shooter);
+        var ev = new ProjectileHitEvent(component.Damage * _damageableSystem.UniversalProjectileDamageModifier, target, component.Shooter);
         RaiseLocalEvent(uid, ref ev);
 
         var otherName = ToPrettyString(target);