#4208 toolbar improvements

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@36237 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Command line option --showCAS=disable removes CAS view and CAS perspective

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@36238 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Perspectives update

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@36239 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e