Don't respond to TAGMSG with away replies

[eskimo]

Typing TAGMSG's cause ergo to send countless away replies as you type the message in PM to someone.

[06:52:32]	<eskimo> ohai
[06:52:32]	DALEK is away (Gone til 5pm)
[06:52:32]	DALEK is away (Gone til 5pm)
[06:52:39]	DALEK is away (Gone til 5pm)
[06:52:41]	<eskimo> hows it goin
[06:52:41]	DALEK is away (Gone til 5pm)
[06:52:43]	DALEK is away (Gone til 5pm)
[06:52:46]	DALEK is away (Gone til 5pm)

[slingamn]

A concern was raised that this contradicts the specification, because the specification might mandate that TAGMSG is treated the same as PRIVMSG for all purposes. However, I don't really see the concern because NOTICE does not get RPL_AWAY, and the specification doesn't seem to say that TAGMSG is more like a PRIVMSG than it is like a NOTICE:

https://ircv3.net/specs/extensions/message-tags.html#the-tagmsg-tag-only-message