SPIGOT-2285: New CommandBlock types.

By: md_5 <git@md-5.net>

paper-server/src/main/java/org/bukkit/craftbukkit/block/CraftBlock.java

@@ -287,6 +287,8 @@ public class CraftBlock implements Block {
         case SKULL:
             return new CraftSkull(this);
         case COMMAND:
+        case COMMAND_CHAIN:
+        case COMMAND_REPEATING:
             return new CraftCommandBlock(this);
         case BEACON:
             return new CraftBeacon(this);