Update the pixel expectations for editing/ for the Mac port.

        For the tests that currently fail on Snow Leopard with --pixel-tests
        --tolerance 0, this moves the current pixel results to mac-leopard and
        adds new Snow Leopard-specific results to platform/mac.

        List of files omitted due to length but composed entirely of moves from
        platform/mac to platform/mac-leopard and newly added files in
        platform/mac.

        Some tests had differences due to spell correction underlining, those
        were skipped since it's not clear what the correct dictionary state is.

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@71084 268f45cc-cd09-0410-ab3c-d52691b4dbfc