Move closer to a setup where the project tree API can change.
This patch also makes sure "Generated files" will be below the
product file of each product and above any Groups/folders/files.
Change-Id: I728289372d40b809105f55adbe50fd424b19e0a0
Reviewed-by: Christian Kandeler <christian.kandeler@qt.io>
Move code to set up the tree of project nodes out of the project
nodes themselves. This makes them easier to manage and will enable
creator to change to a less update-intense project tree.
Change-Id: I2d0702d257e87543f47ebfb456344423ebe4f871
Reviewed-by: Christian Kandeler <christian.kandeler@qt.io>
