* librb is no longer a separately configured subproject.
* charybdis is now a standalone directory with a binary.
* Include path layout now requires a directory ircd/ rb/ etc.
Also fix up some return values and stuff to use bool (or void if
nothing). I just did it whilst I was here.
According to jilles, the return value used to signify whether or not the
client had exited. This was error-prone and was fixed a long, long time
ago, but the return value was left int for historical reasons.
Since the return type is not used (and has no clear use case anyway),
it's safe to just get rid of it.
- Do not use hide_error_messages for certain "safe" ERRORs.
- If hide_error_messages hides an ERROR from a handshake,
send a server notice anyway, but without the message
text.
- Send server notices about ERRORs from handshakes network
wide if it was a remote connect.
