CeylonFormatterConstants: Remove unneeded imports
Update formatter config space tab (preview, phrasing)

Preview again converted with

    xclip -o | while IFS='' read line; do echo '+ "'"${line//\"/\\\"}"'\n"'; done

from 29e6c54. (This preview code is a bit more contrived than the others
because it needs to contain a lot of language features.)