anchordocking: auto save on IDE close, disable in options

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@46607 4005530d-fff6-0310-9dd1-cebe43e6787f
anchordocking: diable header options when no headers shown

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@46608 4005530d-fff6-0310-9dd1-cebe43e6787f