Restrict command & structure block placement

You can't place these blocks without Op & Creative;
WorldEdit should also disable placement of them by default.

worldedit-bukkit/src/main/resources/defaults/config.yml

@@ -29,7 +29,7 @@ limits:
     butcher-radius:
         default: -1
         maximum: -1
-    disallowed-blocks: [6, 7, 14, 15, 16, 26, 27, 28, 29, 39, 31, 32, 33, 34, 36, 37, 38, 39, 40, 46, 50, 51, 56, 59, 69, 73, 74, 75, 76, 77, 81, 83]
+    disallowed-blocks: [6, 7, 14, 15, 16, 26, 27, 28, 29, 39, 31, 32, 33, 34, 36, 37, 38, 39, 40, 46, 50, 51, 56, 59, 69, 73, 74, 75, 76, 77, 81, 83, 137, 210, 211, 255]
 
 use-inventory:
     enable: false