Generic Project: Change order of includes

Task-number: QTCREATORBUG-10198

Change-Id: Iff86f5ea19a4e4730b1bb1d21381d689369efea1
Reviewed-by: Tobias Hunger <tobias.hunger@digia.com>
GenericProject: Simnplfy code handling includes

Change-Id: I42ee45920907d3d55a3adf77901b37fbf45bb70b
Reviewed-by: Tobias Hunger <tobias.hunger@digia.com>
QtVersionManger: Save one save()

We are saving anyway in extensionsInitialized()

Task-number: QTCREATORBUG-10455
Change-Id: I6cdc0f11a3f0f9db5061ef1c00646de4c3251d05
Reviewed-by: Tobias Hunger <tobias.hunger@digia.com>
Generic Project: Use relative paths for importing

Task-number: QTCREATORBUG-10387
Change-Id: I75746491dc7dee358748aa89829ba2d6f12c0e1b
Reviewed-by: Tobias Hunger <tobias.hunger@digia.com>