This change introduces several data updates for the test htmlFromCpp,
that will help us prevent possible regressions in the future.

Enhancements include:
1. CPP function with default arguments.
2. Usage of \qtvariable to produce appropriate qmake instructions.
3. Obsolete and deprecated members.

Change-Id: I9e1d346b43f515f649004d180d1ddead67df97b4
Reviewed-by: Paul Wicking <paul.wicking@qt.io>