Item creation in List editor is not customizable

[m-vdb]

https://github.com/powmedia/backbone-forms/blob/master/src/editors/extra/list.js#L91-L98

This would be great to have hooks on this part of code:

• for the Item class (other than editors.List.Item), something found in this.schema.ItemClass
• for the options to pass to the item initialisation (for instance, item initialisation support templates)

[devel-pa]

+1