Custom notiffications: new macros for service, subservice and auth token

[fgalan]

New macros:

• service
• servicePath
• authToken

populated with the values in the update triggering the notification, to be used in any place in which a macro can be used at the present moment.

In the case of an attribute named the same way, the macro will use the value in the attribute (backward compatibility). However, that case is probably an anti-pattern.

[fgalan]

PR #4166