template support for array item names

[miguelgrc]

Closes #24

• stringify and stringifyTmpl in children item.children.props.uiSchema["ui:options"] have been deprecated in favor of itemsDisplayTitle in uiOptions in the list component. We should remove them completely once @pamfilos takes care of the backend and existing schemas in CAP.
• Moved codemirror editor to formule and refactored it to work with our new use case and to follow the app styling. I have not yet removed codemirror from CAP, but it could be done anytime and it should work right away (we just need to export the viewer and editor from formule and import them in CAP, to be done in another task)
• itemsDisplayTitle can be set in a codemirror editor which has jinja syntax highlighting
• Added useWith: true to squirrelly's render method to be able to use {{asd}} in templates instead of having to prefix it with it. ({{it.asd}})

[github-actions]

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