Kits: Avoid some more calls to displayName()

Change-Id: I9096e2e762d52b55bf5d71b77666708fc7c7eb5a
Reviewed-by: hjk <hjk121@nokiamail.com>
Clean up QmakeProjectImporter

Mostly namespaces, an unused variable, ...

Change-Id: Ia2b879873eae7cb25f796f6bcf18b10bf3de1ff6
Reviewed-by: Tobias Hunger <tobias.hunger@theqtcompany.com>