LCL: added mergesort for parts of TFPList

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@40304 4005530d-fff6-0310-9dd1-cebe43e6787f
IDE: GetAllRequiredPackages: sort for topological lvl and name

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@40306 4005530d-fff6-0310-9dd1-cebe43e6787f