Make getThingInfo return additional information for a new modmail thread.

[creesch]

Needed for the replaceToken function which in turn is needed in order to be able to close #787

[creesch]

That or make a new function for it... considering that it is next to impossible to feed it a "thing" since the information is spread out over an entire page...

Probably the latter because that also allows us to grab new stuff like:

• isBanned
• isMuted
• latestSubmissions
• latestModmails
• latestComments

Now that I have thought about it a bit more, I am probably am going to do the latter and make a new clean function for it.

[creesch]

This is halfway done. It now returns the proper information.

I still want to add the new information so it can be used in tokens.

Good enough for 3.6 though :)