#4207 AxisPanel fixes (css mostly)

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@33000 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Use same icon for main menu and popup menus

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@33001 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e