Custom model data

How to use

Simply add "customModelData : XXX" into item configuration section and do a /cs reload.

menus:
  '0':
    name: Test
    openWith: CLOCK
    items:
      count: 1
      '0':
        itemType: CHEST
        itemName: My custom model data item
        autoClose: true
        actions:
        - tell:I am custom
        customModelData: 123456