Removed more MetadataConstants references from omod project. Still need to consider how we use UUIDs for testing equality of objects against constants
Added Metadata.hasIdentity() so that we can check for known metadata items without assuming that identifiers are UUIDs
* Added IdentifierManager.getPatientDisplayIdentifiers which uses this to return patient identifiers which should be displayed
Removed dob, gender and identifiers from patient summary panel as these are visible in the patient banner
Removed remaining references to MetadataConstants and deleted this class. An "instance" of Metadata is now available in the fragment/page contexts