Recompute RW coords of mouse events in Mobile (#3061)

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@23663 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
GeoElement -> GeoElementND to avoid typecasts

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@23664 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e