Support use of source.url in statements for linking to entity or person pages on public BO registers

[StephenAbbott]

Adopters of BODS who make use of the BODS visualisation tool/library may wish to use the source.url field in BODS statements to provide a link to a public BO register where all the details for the entity or person in question can be found.

This ticket is for us to scope out the work required to support similar behaviour to that provided by Cytoscape on the current version of the Open Ownership Register where you can click on any node in the graph view and be offered a 'View page' option: