Restructure the sources for a little clarity.

From DESIGN:
Directory structure of project
. Plasmoid sources
./libs Headers shared by all code
./libs/storage Storage layer shared library (libknmstorage) for loading and saving NM settings
./libs/ui UI shared library (libknmui) for settings
config widgets
./settings (Any source code in this directory is unused)
./settings/service Settings service using libknmstorage
./settings/config KCM for configuring settings using libknmstorage and libknmui
./settings/test (Unused test code, scheduled for merging/moving)
./tests Proof-of-concept code, not proper unit tests yet

Current state of project:
service: works but not yet a kded module
config: kcm just a skeleton, lots to do today there
applet: may work but needs lots of cleaning