some new functions for events to store information properly;
refactored event convertion;
added functions for get devices and get events;
Merge branch 'model'
fixed merge issues...whatever

Signed-off-by: gormed <hans.ferchland@gmx.de>
added Geogebra Kinderwagen.ggb

Signed-off-by: gormed <hans.ferchland@gmx.de>
added documentation

Signed-off-by: gormed <hans.ferchland@gmx.de>
SOME CHANGES