[Dillo-dev] CSS class handling updated

Hi, the CSS class handling has been updated to support multiple class names as defined in the CSS 2.1 specification. Obviously dillo now has to do some more work to handle the cases with multiple class names. However I hope that at least on pages that do not use this feature performance did not change noticably. If you find a case where the current code feels slower than 2.1.1 please let me know. Cheers, Johannes