Gun tweaks (#8320)

Content.Shared/Interaction/Events/MeleeAttackAttemptEvent.cs

@@ -0,0 +1,16 @@
+namespace Content.Shared.Interaction.Events;
+
+/// <summary>
+/// Raised on directed a weapon when being used in a melee attack.
+/// </summary>
+[ByRefEvent]
+public struct MeleeAttackAttemptEvent
+{
+    public bool Cancelled = false;
+    public readonly EntityUid User;
+
+    public MeleeAttackAttemptEvent(EntityUid user)
+    {
+        User = user;
+    }
+}