Follow-up from "Add additional user actions in Audit events"

The following discussion from !2103 (merged) should be addressed:

• @grzesiek started a discussion: (+1 comment)

  I wonder if this should be a class that takes @model as an argument to the constructor, since it is clearly a dependency. It would make implementation a little more complex than include EE::Audit::Changes, so feel free to choose what works better for you.