IDE: mode matrix: show diffs in modes diff dialog

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@41515 4005530d-fff6-0310-9dd1-cebe43e6787f
IDE: build modes diff: do not show current mode in tree

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@41516 4005530d-fff6-0310-9dd1-cebe43e6787f