metal foam grenades (#29428)

* metal foam grenades

* wow okay

* meh

* bruh

* test

* push

Content.Shared/Spreader/EdgeSpreaderPrototype.cs

@@ -10,4 +10,10 @@ public sealed partial class EdgeSpreaderPrototype : IPrototype
 {
     [IdDataField] public string ID { get; } = string.Empty;
     [DataField(required:true)] public int UpdatesPerSecond;
+
+    /// <summary>
+    /// If true, this spreader can't spread onto spaced tiles like lattice.
+    /// </summary>
+    [DataField]
+    public bool PreventSpreadOnSpaced = true;
 }