DSNP Announcement Id -> DSNP Announcement Uri

[wilwade]

Problem

DSNP Announcement Id and User Id were out of spec naming and requirements

178882099

Solution

Update to match the v1.0 Spec

Double Checks:

• [x] Did you update the changelog?
• [x] Any new modules need to be exported?
• [x] Are new methods in the right module?
• [x] Are new methods/modules in core or not (i.e. porcelain or plumbing)?
• [x] Do you have good documentation on exported methods?

Change summary:

• DSNP Announcement Id -> DSNP Announcement Uri
• DSNP User Id remove prefix
• DSNP User Uri is User Id with prefix
• DSNP User Id is allowed to trim leading zeros