Adding ability for hooks to return, and OnRaw hook
Adding ability for hooks to return, and OnRaw hook

By adding the ability for hooks to return, we can stop the processing of a line at any point.
This is used by the OnRaw hook such that any non-nil return value will cause the irc library to assume that line has been handled.

wolfy1339/LuaIRC,JakobOvrum/LuaIRC