All form fields (except sliders) can now be saved

* All form fields, except the memory limit sliders can now be saved using the WTForms form.
* The logic in the view function has been cleaned up as much as possible.
* get_container_settings now also returns the bucket token (was needed for edit form)
* type becomes network_type in CGROUP_EXT, because "type" cannot be used in the form (name of a python keyword)

The form overhaul is now *almost* done