Add summary to cmake run log

Summary:
Also

• require cmake 3.0 as elsewhere in kdev world
• mark ItemModels for future removal
• check for cargo as runtime dep
• use module specific KDEV_CARGO id for logged debugging

Reviewers: mihac, kfunk

Reviewed By: mihac, kfunk

Subscribers: kfunk, kdevelop-devel

Differential Revision: https://phabricator.kde.org/D9306