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7.20.2 irc variables

The standard script defines the following set of redefinable variables:

`IRC::hot_words'
list of regular expressions which will generate notice messages. The analyzer searches for these patterns in user messages, notices and all unknown IRC commands.
`IRC::ignore_in_other_msgs: set[string]'
list of IRC commands which are ignored in the events for unknown commands.
`IRC::ignore_in_other_responses: set[count]'
list of IRC return codes which are ignored in the event for unknown return codes.

These variables contain information about users and channels which were identified by Bro.

`IRC::users: table[string]'
contains all identified IRC users as irc_user objects.
`IRC::channels: table[string]'
contains all identified IRC channels as irc_channel objects.