IDE: Use string const lisDefault = 'Default'

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@40890 4005530d-fff6-0310-9dd1-cebe43e6787f
IDE: Improve Window options frame with hints.

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@40891 4005530d-fff6-0310-9dd1-cebe43e6787f