#4991 potential NPE fix

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@35882 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
#4491: notify kernel about 3D usage from MyVecNode3D, code cleanup

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@35883 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
More code cleanup

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@35884 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Do not init EV3D from keyboard event

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@35885 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e