SynEdit: ability to mark if/then/else as word pair (triplet)

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@43812 4005530d-fff6-0310-9dd1-cebe43e6787f
IDE: Editor-Options: mark if/then/else as word pair (triplet) / allow any keyword pair to be switched

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@43813 4005530d-fff6-0310-9dd1-cebe43e6787f