as suggested in #212, it seems the majority of people don't understand
that input was expected to be in regex format and people were using
filter lists containing plain hostnames, e.g. `www.google.com`.
apart from that, using fnmatch() for matching is actually a lot less
computationally expensive and allows to use big blacklists without
incurring a huge performance hit.
the config file now understands a new option `FilterType` which can
be one of `bre`, `ere` and `fnmatch`.
The `FilterExtended` option was deprecated in favor of it.
It still works, but will be removed in the release after the next.
