Allow adding Locate engines to client

[dstillman]

Not sure how difficult this is.

[dstillman]

(I also suspect almost nobody uses these, so it's not a priority.)

[adomasven]

https://forums.zotero.org/discussion/67480/add-locate-article-lookup-engine-in-zotero-5-connector

Currently no way at all to add locate engines. Neither through the connector, nor the engine manager. We can add this, but I need a walkthrough: docs, relevant code in Z4fx, etc.

[bwiernik]

The option to edit existing Locate Engines in the client would also be nice zotero/zotero#336

I supply a modified engines.json file when I teach classes on using Zotero for systematic reviews--it would be really nice to be able to send students to a website to add them instead.

[ashwinvis]

(I also suspect almost nobody uses these, so it's not a priority.)

I am using it a lot while working away from the university LAN. Until this is fixed, this is a useful resource for manually configuring lookup engines: https://egh.github.io/zotero-lookup-engines/