make dragons breathe fire (#26746)

* add ActionGun system

* add RepeatingTrigger

* dragons breath projectile, repeatedly explodes

* give dragon fire breathing action, fireproof it

* oop

* oop 2

* prevent troll

* proper repeating thing

* pro

* webedit ops

* realops

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Co-authored-by: deltanedas <@deltanedas:kde.org>

Content.Server/Explosion/Components/ExplosiveComponent.cs

@@ -81,6 +81,13 @@ public sealed partial class ExplosiveComponent : Component
     [DataField("deleteAfterExplosion")]
     public bool? DeleteAfterExplosion;
 
+    /// <summary>
+    /// Whether to not set <see cref="Exploded"/> to true, allowing it to explode multiple times.
+    /// This should never be used if it is damageable.
+    /// </summary>
+    [DataField]
+    public bool Repeatable;
+
     /// <summary>
     ///     Avoid somehow double-triggering this explosion (e.g. by damaging this entity from its own explosion.
     /// </summary>