Add tracing of intrinsic attributes and edits.

[Emma Söderberg]

The current tracing implementation primarily exposes events for attribute evaluation. The currently expose information almost enables creation of an external dependency graph, but some tracing events are missing to make this fully possible. In order to get all dependencies for the graph, events for reading of intrinsic attribute values (e.g., getChild) need to be added. In addition, in order to register that the graph is invalid, events for edits of intrinsic attribute values (e.g., setChild) should also be added.