Allow quoting full messages when replying

[blastrock]

This adds a configuration option quote_messages which allows quoting full messages when replying to a message in Matrix.

Disabled (default, and current behavior):

<alice> hello
<bob> alice: hi

Enabled:

<alice> hello
<bob> > alice: hello
<bob> hi

I find that when there are a lot of people talking on a channel, or when answering an old message, quoting it fully makes more sense than just mentioning the author.

Since I didn't want to change the behavior too much, I kept the current behavior as the default, but I suggest we change the default to the new behavior (or even remove the config option and make it the only behavior...?).

[roughnecks]

I would personally really like to see this merged.

[hifi]

Would be nice(r) to have it in the style of #214 so it's a general reply quote configuration that could have more states than two but I'd like to keep the original behavior at least for now as the default.

Otherwise I'm good with merging this.

[blastrock]

So, would you prefer something like

REPLYBEHAVIOR ( --mention-author | --quote-message )

? Tell me if you prefer different names :)

I think I'll also change the quoting style to something more irc-y as explained in the issue, without option to choose the style

<bob> <alice> hello
<bob> hi

If that's fine with you

[hifi]

Sounds good!

Maybe REPLYMODE (--mention | --quote) so it's a bit more concise?

One thing I noticed just now was that this needs to be a network level setting (unfortunately) as setting and enforcing a global mode for shared Heisenbridges isn't ideal. It's also not ideal that you need to reconfigure it per each network but it's better than forcing everyone to use a single style.

[blastrock]

All done. This is now a network setting only, with the naming you proposed. I kept the default as mention and used the IRC-style quoting.

[blastrock]

Hello,

Do you think this could be merged? This is still a feature I miss regularly