E.g.,
<pragma-> Userbob: You can learn more about candide by reading its !help page and checking out its !source
<candide> Userbob: To learn all about me, see http://www.iso-9899.info/wiki/Candide
<candide> Userbob: My guts can be browsed at https://github.com/pragma-/pbot
Only three triggers will be processed per message. (I should create a
registry entry to customize this.)
Messages that are addressed at a specific user that exists in the channel will
have that user's name prepended to the factoid output.
Factoid triggers that are referenced from within messages will not produce
error messages if the factoid is not found.
Factoids that have an $arg or $nick special variable will not be triggered as
a reference.
Factoids that have the `noembed` meta-data value set to a true value will not
be invoked as a reference.