Ticket #3485: still preparing for the operation of using something else than DockPanelW in case of simple applets

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@27572 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Ticket #3485: still preparing...

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@27573 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Ticket #3485: still preparing for the option for simpler panels for simple web applets

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@27574 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e