Login via API, login listener improved

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@32983 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Tidying OrthogonalLine(point, line, xOyPlane)

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@32984 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
NPE fix

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@32985 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e