Improve structure of generated code

While being generated code it's still useful to make it human-readable
(since it's public API consumed by the QtRO user).

Changes:
- Move Q_PROPERTY decls to top
- Move enum decls + Q_ENUM{,s} decls to top
- Add newlines where appropriate

Change-Id: I2ecd597676c4feb6838ad40ec38969fbc30dfc8b
Reviewed-by: Continuous Integration (KDAB) <build@kdab.com>
Reviewed-by: Brett Stottlemyer <bstottle@ford.com>