Need to link friendly IDs to fields which require a standard _id

[taylortom]

i.e. need to be able to specify the friendly ID rather than the standard _id to avoid any broken linkages when _ids are updated (e.g. copy/import etc.).

One approach to this is to create a user-friendly lookup API which would do this behind the scenes (see adapt-security/adapt-authoring#165).

We'd also have to make sure the isObjectId attribute isn't used on the schemas which require this, as that has additional type coercion etc.

[taylortom]

Would be good to use friendlyId as a filter to reduce the number of results

[taylortom]

This is handled by the build process in adaptframework