ui: node/ACME: add ACMEDomainEdit

ui: node/ACME: add ACMEDomainEdit

which expects a nodeconfig (for digest and domaincount)
and for the edit case, the parsed 'domain' object

this editwindow has three fields:
* type selector (standalone/dns)
* domain
* plugin (only for dns)

if the user chooses dns but there are already the maximum count of
acmedomainX entries, the type field gets invalid (with a error tooltip)

the onGetValues method is non-trivial, because of the mixing of
acmedomainX and acme.domain values, so we have to be careful
that we delete/edit the correct entry

Signed-off-by: Dominik Csapak <d.csapak@proxmox.com>