Resolves #552

Sends associated lines through ReadLine() rather than PutIRC(), this allows the user to alias to znc core or module commands as well.
Sorry for the delay, I've been inactive on Github for quite some time.

It's static because m_pClient->ReadLine(rawLines[i]); can also enter OnUserRaw, and without static the sending_lines would be false in the next OnUserRaw call.