- Allow overriding privileges from the <class> blocks in the <type>
and <oper> blocks.
- Separate oper types from oper accounts in the code. This enables
moving some core stuff out of the config tag later.
- Merge the config tags together to make a synthetic tag that can
have getXXX called on it instead of using getConfig and then
converting it.
- Move the details of Have*Permission into the oper type class.
- Improve oper events to allow modules to easily hook into the oper
system.
Currently on invalid modes we do a combination of different things:
1. Send a custom mode-specific numeric (which often collides with
other modes).
2. Send a server notice.
3. Do absolutely nothing.
This new numeric is a generic way of handling invalid parameters
when setting a mode that avoids all of the mistakes of the previous
behaviour.
