This is a helpful ADialog wrapper that manages it’s open state by
itself.

This is sometimes useful when we don’t want to modify the global page
navigation state, but want to use independent lists.

This should make the API functions more accessible for callers as there
won’t be any loose undefined values that were sometimes needed to skip
certain values in certain API endpoints.

Instead, every positional argument is now required and all configurable
options or extensions are part of the options object.

refs #179

refs #179

Using the ID type makes type errors more likely because we accept a
wider range of types as arguments for API operations than we actually
support on a logic level, i.e. when using maps because

	Map<ID, T>.get('1') !== Map<ID,T>.get(1)

Sometimes we want to query the API for certain objects. We can now do
that by passing a URLSearchParams object to list operations.

All requestInit arguments could have been undefined already, because we
declared it as an optional argument, but sometimes it’s nice to
explicitly skip the argument with `undefined` which is now possible as
well.

Sometimes we don’t have a static list of choices but an async source for
them (like an API endpoint). This is now supported out of the box
through the searchProvider prop.

refs #185