We now use the more flexible ErrorDetailArray data structure from
@rokoli/bnb which makes it harder to accidentally ignore or miss errors.

refs #257 #258

refs #247

refs #116

This is helpful if the FormGroup is used as a container for other fields
which may have errors but the root FormGroup is used for propagating a
save state.

refs #186

refs #242

We often find ourselves adding flex styles to buttons. Instead, this
should be the default.

Although the docs [1] specify a class on Popover components, this
doesn’t seem to be passed down. We help ourselves with a selector for
the data-headlessui-state attribute .

[1] https://headlessui.com/vue/popover

* deactivate buttons and show progress indicator while saving
* place primary button first
* add spacing between buttons
* add support for custom labels for cancel and save

The FormGroup’s save-indicator would jump around when used in
combination with the FormTable. We now have a more tight coupling for
these components so that the FormTable can influence the FormGroup’s
rendering.