Revisit IRC color handling

[davidben@mit.edu]

vasilvv tells me that BarnOwl displays some IRC color codes funny for some MediaWiki thing. It seems we have some regex in BarnOwl::Module::IRC::Connection::strip_irc_formatting to remove colors (with a comment to maybe translate into zephyr colors). Evidently this is missing whatever MediaWiki's thing is doing.

Now that we're using AnyEvent::IRC, we have an AnyEvent::IRC::Util::filter_colors. It's probably as easy as replacing the regex with a call to filter_colors, but someone should probably look into this first to verify it's what we want.

[vasilvv@mit.edu]

The relevant test channel is #en.wikipedia on irc.wikimedia.org.