Add PreRegister hook

This is useful for CAP commands and SASL.

doc/irc.luadoc

@@ -125,6 +125,7 @@ function irc:shutdown()
 
 --- List of hooks you can use with irc:hook. The parameter list describes the parameters passed to the callback function.
 -- <ul>
+-- <li><code>PreRegister(connection)</code>Useful for CAP commands and SASL.</li>
 -- <li><code>OnRaw(line) - (any non false/nil return value assumes line handled and will not be further processed)</code></li>
 -- <li><code>OnDisconnect(message, errorOccurred)</code></li>
 -- <li><code>OnChat(user, channel, message)</code></li>

init.lua

@@ -116,6 +116,9 @@ function meta_preconnect:connect(_host, _port)
 
 	self.socket = s
 	setmetatable(self, meta)
+	
+	self:invoke("PreRegister", self)
+	self:send("CAP END")
 
 	if password then
 		self:send("PASS %s", password)