Core: Add support for Web Components #2493
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Description
This PR tries to add validation support for custom elements (Web Components). See #2492 for a first technical analysis.
It's possible that the current implementation is not good enough. Especially the part where I added the customElements to both, the "focusin.validate focusout.validate keyup.validate" events and to the "click.validate" events. Maybe we would need to try to differ there or we should go with "more settings value" mentioned in #2492 approach?