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The qtc module gathers properties that used to live in the top-level
project file. This is the first step towards making it possible to build
plugins against an installed Qt Creator ("out of source build").

Change-Id: Ia1514cc9c888e80be01b308e908de48980fcbdb8
Reviewed-by: Joerg Bornemann <joerg.bornemann@qt.io>

Change-Id: I17330fa27effc633a06bc8f0a5864e771b831476
Reviewed-by: Jake Petroules <jake.petroules@qt.io>