Fixes from Alexey Lagunov:
1. Fix AV on set frPrinGrid.Font property
2. Fix set Visible in script for dialog controls
3. Fix show frDataSet in object inspector after delete it from DialogPage
4. In Object Inspector sort compnent names in combobox
5. Fix string with '''' char


git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@43162 4005530d-fff6-0310-9dd1-cebe43e6787f