Added regex filter settings and new filter-urls setting
Created by: MichaelHeerklotz
Added regex filters (--accept-regex, --reject-regex, --regex-type) like in wget1, doc was already there, but the code for it was missing.
Added the new setting "--filter-urls" which will apply the filter on the URL before adding the URL to the job queue.
I also updated the doc for "--accept-regex" and "--reject-regex" to clarify that these are applied on the file name like "--accept and --reject" by default (if --filter-urls is off).