DataForm (NodeConfiguration, etc) toBuilder or something similiar #162
Description
Original report by Daniel Gultsch (Bitbucket: iNPUTmice, GitHub: iNPUTmice).
When working with configurations of server side things. The process is usually retrieve the current configuration; make the change; submit the change. For example if I want to change the access model of a PubSub node (and not change the rest) I retrieve a NodeConfiguration and then due to immutability create a new NodeConfiguration that is exactly the same as the old one but with a the access model changed. However I noticed there is a lack of a NodeConfiguration.toBuilder() or something similar that essentially lets me modify the original one.
The same use case probably exists for other configurations based on DataForms (MUC rooms, etc)