YANPE

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@33171 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
#4207 Some css improvement, and Show navbar enables/disables other navbar related options.

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@33172 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Preview for arc/sector in 2D view with 3D points

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@33173 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
tool for arc/sector 3 points with 3D points

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@33174 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
arc/sector is visible in view for plane

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@33175 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e