feat(base): implement late validation #522
Merged
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Late validation allows to delay the validation of slot content until custom elements have been defined.
Note: only enable late validation on web components that don't depend on their children being defined. This may include setting properties/attributes, but not calling methods or instance checking.
To support this change, UI5Element now upgrades all properties (including private) so that when a parent web component sets private properties to children, these will be upgraded as well eventually.
To enable the feature for a slot, use "lateValidation: true"