Proto-kinetic crusher (#16277)

Co-authored-by: AJCM-git <60196617+AJCM-git@users.noreply.github.com>

Content.Shared/Weapons/Ranged/Components/GunComponent.cs

@@ -79,6 +79,12 @@ public partial class GunComponent : Component
 
     #endregion
 
+    /// <summary>
+    /// Whether this gun is shot via the use key or the alt-use key.
+    /// </summary>
+    [ViewVariables(VVAccess.ReadWrite), DataField("useKey"), AutoNetworkedField]
+    public bool UseKey = true;
+
     /// <summary>
     /// Where the gun is being requested to shoot.
     /// </summary>