TAChart: Support PutImage in SVG drawing back-end

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@40092 4005530d-fff6-0310-9dd1-cebe43e6787f
TAChart: Add TChart.OnAfterDraw event

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@40093 4005530d-fff6-0310-9dd1-cebe43e6787f