Allow item lookup from local paths

[jamesrwelch]

At the moment items can be looked up by path - e.g. dm:Test data model$1.0.0|dc:Test data class. This is used in the markdown descriptions of items and works nicely when referring to a finalised item elsewhere in the system.
However, if you're referring to something within the same model, or the same versioned folder, which is not yet finalised, then this causes problems - e.g. all items of dm:Test data model$main|dc:Test data class when the Test data model was finalised, or the branch name was changed.

A 'local' path notation is required so that we can refer to items within the same model / vf without specifying the branch name which is subject to change.

This is a requirement for the Data Dictionary work to save huge amounts of renaming and to generally improve the experience of using links in descriptions.

[pjmonks]

Related to:

• Links from the description field are not valid URLs mdm-ui#852
• MauroDataMapper-NHSD/mdm-plugin-nhs-data-dictionary#11

The NHS Data Dictionary ingest will produce Mauro paths for URLs but they can only be known relative to the versioned folder the items are children of.