Added show or hide the polar grid icon, updated show or hide axis and grid

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@34083 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
#3392 some very basic and initial css.

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@34084 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e