Ignore rewrite about circe

[jorgenschaefer]

The initial steps for this are implemented, the whole thing is mostly unified now.

The last bit from my private notes for when I get around to this:

IGNORE [args] <match> [command]
 Ignore when <match> matches the nick!user@host of a message,
 and [command] matches the command (default: all)

 Args:
 -except
  => Add this pattern to the list of stuff NOT to ignore

 -text <regex>
  => ARGS* must match this

 -noreplies
  => Do not match messages whose target matches the pattern

 -channels <a,b,c>, -channel
  => Applies in these channels (if this is given, this pattern will
     not apply to query buffers unless -queries is given, too; by
     default, it applies to both queries and channels)

 -queries, -query
  => Only in query buffers (if this is given, this pattern will not
     apply to channels unless -channels is given, too; by default, it
     applies to both

 -time <secs>
  => Discard after this amount of seconds


message-option-spec-include, message-option-spec-exclude
- First check exclude. If any match, do nothing
- Then check include. If any match, use the spec.

- [nickuserhost-regexp-or-nil
   command-regexp-or-nil
   text-regexp-or-nil
   replies-p
   channel-regexp-list
   queries-p
   invalid-after
   options]

=> Probably rather a list of plists with (:foo bar :baz qux)?
=> "Best match wins"? What's the "best match"?