IDE: mode matrix: hint for targets syntax error

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@41318 4005530d-fff6-0310-9dd1-cebe43e6787f
IDE: add example projects to recent menu only once

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@41319 4005530d-fff6-0310-9dd1-cebe43e6787f