lazcontrols: added icon

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@40603 4005530d-fff6-0310-9dd1-cebe43e6787f
lazcontrols: added icon for TLvlGraphControl

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@40604 4005530d-fff6-0310-9dd1-cebe43e6787f
lazcontrols: register TLvlGraphControl

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@40605 4005530d-fff6-0310-9dd1-cebe43e6787f