IDE, SynEdit: Accept Ctrl also with the second part of a sequencial key shortcut. Remove obsolete mappings. Issue #24008, patch from Mark Bravington

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@40508 4005530d-fff6-0310-9dd1-cebe43e6787f
Adding Mark Bravington to the list of contributors.

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@40509 4005530d-fff6-0310-9dd1-cebe43e6787f