nenolod gave the thumbs-up to port ircd-seven banfowards to charybdis to spb
for a while, and people have asked about it. Might as well do it since it's a
slow weekend.
Note that as a side effect use_forward is removed from the config and
unconditionally enabled!
This compares two masks and returns whether the "new" is
more specific than or equal to the "old". The difference
with match() is that a '?' in "old" does not match a '*' in
"new".
This makes it impossible to connect hostmasked servers.
(This support didn't work well anyway, was incompatible
with TS6 and we never masked ourselves.)