lcl: clean up

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@40268 4005530d-fff6-0310-9dd1-cebe43e6787f
cody: lvlgraph: fixed freeing node

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@40269 4005530d-fff6-0310-9dd1-cebe43e6787f
cody: lvlgraph: fixed MinimizeOverlappings

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@40270 4005530d-fff6-0310-9dd1-cebe43e6787f