channel mode classification which is required by RPL_MYINFO indicating arity,
and RPL_ISUPPORT indicating an enumerated class. The content of these replies
had previously been generated by hardcoded strings of some letters.
Channel modes require classification which corresponds to the
CHANMODES= data in RPL_ISUPPORT. Classes A,B,C can then be
listed in the unary column of RPL_MYINFO. cflag_add() is updated
for this. Additional cleanup of chmode.h and channel.h
circularity is also proffered within.
Submitted-by: Jason Volk <jason@zemos.net>
Additionally, attempting to use too many modes or two times
the same letter is now detected and prevented.
Modules now request that a channel mode be added/orphaned,
instead of ugly manipulation from which that request had
to be guessed.
Slight changes are needed to modules that provide channel modes.
From the old API, one important function has been made static,
the other important function has been renamed, so loading old
modules should fail safely.
