lazcontrols: clean up

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@47163 4005530d-fff6-0310-9dd1-cebe43e6787f
lazutils: moved MergeSort to lazutilities, laz2_xmlcfg: sort nodes to find non existing and out of order nodes faster

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@47164 4005530d-fff6-0310-9dd1-cebe43e6787f