The useServerErrors function returns an object with optional keys. This
is fine sometimes but it would be nice to have individual variables
containing errors for each field and more importantly we need to display
errors than cannot be mapped to an individual form field.

Using a string key begs for conflicts.

API object attribute names are now:

1. camelCased (#164)
2. use Id / Ids suffix for object references (#172)

Image uploads might take a while and even though we can’t currently show
a progress bar for the upload (because fetch upload progress is still
not a thing) we can at least indicate that something is happening and
disable any interactive UI elements.

refs #144

isProcessing seems more general purpose as it’s not clear if the
provided function actually loads something.

As we wrap an async function we must await it. Otherwise finally is
called immediately.

closes #137

refs #127

closes #141

refs #127

These form components still use bootstrap CSS classes but are part of
our effort to move away from bootstrap.

refs #140

Using :is-open="true" interferes with the dialogs close function in
nested dialogs.

This can be used in views to parse the error state from steering
responses.

We have properties like header, that contain objects that need to be
merged recursively.

Interfering with the default dialog close logic isn’t that smart because
it handles stuff like nested dialogs for us.

We need to find some other logic to close the dialog when someone clicks
on the backdrop, but that can be a task for a later time.

Using the same name as the native HTML dialog is a bad idea.

refs #89

closes #139

closes #138