IDEIntf: set free notification for TPropertyEditorHook.LookupRoot, changed TPropertyEditorHook to TComponent, set freenotification for TCustomPropertiesGrid.TIObject, bug 25872

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@44455 4005530d-fff6-0310-9dd1-cebe43e6787f