Web: only show Axes  / Grid when no geo is selected and no geo is to be created and no other icons are in stylebar

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@26465 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
selecting in AlgebraView; control maximum number of selected GeoElements for each command

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@26466 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e