All nodes in the autotools project tree were of type Resource, which
resulted in strange behavior:-) Get the proper type instead. Apply
some no-risk cleanups while visiting the code.

Task-number: QTCREATORBUG-18371
Change-Id: I370846100239cca91683dd184a1e5a56d3543732
Reviewed-by: Tim Jenssen <tim.jenssen@qt.io>