moved common widget designer classes to generic package

git-svn-id: svn://svn.forge.objectweb.org/svnroot/spagobi/V_4.x/Server/trunk@22666 99afaf0d-6903-0410-885a-c66a8bbb5f81
git-svn-id: svn://svn.forge.objectweb.org/svnroot/spagobi/V_4.x/Server/trunk@22667 99afaf0d-6903-0410-885a-c66a8bbb5f81
refactorized BarChartWidget

git-svn-id: svn://svn.forge.objectweb.org/svnroot/spagobi/V_4.x/Server/trunk@22668 99afaf0d-6903-0410-885a-c66a8bbb5f81