qbs build: Introduce new module "qtc".
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 <email@example.com>
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