Lyns fixes to blocklyeditor/src/blocks/lists.js so that mutators now work:

* new Blockly.Block(...) => Blockly.Block.obtain(...)
* .getTitle_(...) => .getField_(...)
* Blockly.Language.Output => Blockly.Blocks.Utilities.OUTPUT

Change-Id: I5be8a500be4c6f36ca6c1c26f66dc7ff39d62b4f