Backport change from 1.2.0: src/aventreectrl.cc,src/gfxcore.cc: Don't use deprecated members or methods of wxKeyEvent.
git-svn-id: file:///home/survex-svn/survex/branches/1.0@3687 4b37db11-9a0c-4f06-9ece-9ab7cdaee568