LP1858138 Link selector consolidation/repairs

LP1858138 Link selector consolidation/repairs

Move more of the IDL link class selector extraction logic into the IDL
service.

Avoid using 'name' as a fall-through selector field when no 'name' field
exists on the class.

Teach the idl service to log warnings on invalid class and field name
combinations in selector lookups.

Modify fm-editor and combobox to use the new idl link selector
functions.

While we're in there, avoid unnecessary API calls from the combobox
by preventing async data lookups with a search term of "_CLICK_".

Signed-off-by: Bill Erickson <berickxx@gmail.com>
Signed-off-by: Galen Charlton <gmc@equinoxinitiative.org>