gtk3: implemented standard cursors


git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@41812 4005530d-fff6-0310-9dd1-cebe43e6787f
TAChart: Add 'script' demo

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@41813 4005530d-fff6-0310-9dd1-cebe43e6787f