The "spawner|mobType" syntax once again makes functional mob spawners.

Also fix block parser context not being restricted.

worldedit-core/src/main/java/com/sk89q/worldedit/extension/platform/Platform.java

@@ -63,7 +63,7 @@ public interface Platform {
      * Checks if a mob type is valid.
      *
      * @param type The mob type name to check
-     * @return Whether the name is a valid mod bype
+     * @return Whether the name is a valid mod type
      */
     boolean isValidMobType(String type);