Drop jQuery

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Notes:

• This PR points to https://github.com/unic/estatico-nou/pull/61 since I was lazy 😱
• In my defense: It was created while sitting at a catalonian beach. 🏖
• I tried to change as few lines as possible and went for dom-delegate to replace the previous event system (after checking out about every DOM event abstraction I could find). The main difference is probably that there is no .add.some.namespaces thingie no more. So instead of unbinding events via namespaces we rather keep track of all listeners belonging to a module. The events and mediaqueries helpers don‘t use the delegate library in a very smart way, but I guess this code will be replaced soon anyway.
• Some polyfills for older browsers were added (small ones loaded by default, larger ones like fetch on demand)
• The failing QUnit are replaced with a separate PR: https://github.com/unic/estatico-nou/pull/62
• After this, we’ll have a good base to refactor the whole approach (using more reasonable init triggers like Mutation|IntersectionObserver, lazy-load complete modules etc.). @christiansany has some great ideas.

Thoughts?

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Generally, I'd also focus on new implementations of MediaQuery and WindowEventResizer (https://www.npmjs.com/package/@unic/factory-breakpoint-manager) (windowEventResizer not yet implemented)

@christiansany, absolutely, but as stated above, I wanted to keep the changes as minimal as possible so we can discuss new architectural approaches separately of dropping jQuery.

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@christiansany, I have added two basic polyfills: NodeList.forEach and CustomEvent. Additionally, a fetch polyfill is loaded asynchronously if needed.