IDE: package editor: started drag drop

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@45475 4005530d-fff6-0310-9dd1-cebe43e6787f
IDE: source editor: fixed crash when no quickfixes available

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@45476 4005530d-fff6-0310-9dd1-cebe43e6787f