IDE: hide msg unit not used for package main source

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@45153 4005530d-fff6-0310-9dd1-cebe43e6787f
IDE: msg frame: show info why project needed compile

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@45154 4005530d-fff6-0310-9dd1-cebe43e6787f