Log user quit messages

[elyscape]

Since OnIRCDisconnected() doesn't include the quit message, and OnQuit() isn't called when the user quits, we need to hook OnSendToIRC().

[codecov]

Codecov Report

Merging #1395 into master will decrease coverage by 0.02%.
The diff coverage is 0%.

@@            Coverage Diff             @@
##           master    #1395      +/-   ##
==========================================
- Coverage   40.82%   40.79%   -0.03%     
==========================================
  Files         109      109              
  Lines       21777    21785       +8     
==========================================
- Hits         8890     8888       -2     
- Misses      12887    12897      +10

Impacted Files	Coverage Δ
modules/log.cpp	20.57% <0%> (-0.71%)	⬇️
modules/simple_away.cpp	58.77% <0%> (-1.76%)	⬇️

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[elyscape]

An alternative way to handle this would be to add a new module hook that fires when the user quits, something like OnUserQuit()/OnUserQuitMessage(). Should I do that instead?

[elyscape]

Looks like OnUserQuit() exists and is called when a client sends a quit message, which isn't the same thing. So in that case maybe OnUserIRCQuit()/OnUserIRCQuitMessage()?

[DarthGandalf]

Move & to left

[DarthGandalf]

There is Message.As()

[DarthGandalf]

This may break if any tag is sent.

[elyscape]

How do you mean?

[elyscape]

Oh, I see. That being said, do we ever send quit messages with tags?

[elyscape]

If #1398 is merged before this, I can rebase this on top of that to use OnSendToIRCMessage instead of OnSendToIRC. That would have the dual benefits of simplifying the check for quit messages and removing the need to check for tags.

[elyscape]

Reworked to use OnSendToIRCMessage().