Split up qtprofilesetup.cpp.

It's gotten unruly. Move QtModuleInfo into its own set of files and move
some code into new member functions. Also move the module list
generators into that file.

Change-Id: If87269cc509c730084257ac4f254def529e43b5b
Reviewed-by: Joerg Bornemann <joerg.bornemann@digia.com>