[scons] QtCreator: add parameters for additional source files
[scons] QtCreator: add parameters for additional source files

Sometimes we want to be able to view files in QtCreator,
that are not used to build the program directly.
One example for this are the xml files used by our communication.
This patch makes it possible to inject additional source files
from the SConstruct.

dergraaf/xpcc,dergraaf/xpcc,dergraaf/xpcc,dergraaf/xpcc