ProjectExplorer: Remove unused member variable

Change-Id: I1bab5ff9b7c4ead87b2dd370cf2fb15587604f0c
Reviewed-by: hjk <hjk121@nokiamail.com>
ProjectExplorerPlugin: Use one factory for all project managers

Change-Id: Ie2204cd82bf8e060136fd28098cce5affac2cbde
Reviewed-by: hjk <hjk121@nokiamail.com>
Reviewed-by: Eike Ziller <eike.ziller@digia.com>
CMakeProject: Handle subdirectories with different defines/include paths

While we do know all the parts, we don't know to which part each file
belongs. So we guess that based on file system proximity.

Task-number: QTCREATORBUG-12359
Change-Id: I9d2a2ca0171b4e43f4a65d2f4b7b318f4e8b451c
Reviewed-by: Daniel Teske <daniel.teske@digia.com>