Optimize ellipse drawing

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@35837 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
fix ToolImage[] for new icon names

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@35838 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
fix Help dialog for new icon names

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@35839 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e