Added masking stuff.

Basically, so that we can hold user modes and channel modes in the same list, we use bitwise masking.
We have a list of handlers, 256 in size 0 through 255, and to work out where a mode handler is dependent
on WHAT it is, we use this simple hashing algorithm (no collisions can occur):
(modeletter - 65) | mask
Where mask is 128 (10000000b) if its a user mode, or 0 (00000000b, duh) if its a channel mode.
Smart, and much faster than using a map of pairs.


git-svn-id: http://svn.inspircd.org/repository/trunk/inspircd@4128 e03df62e-2008-0410-955e-edbf42e46eb7

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