TS21 Support

[bengold]

Miniware has a new soldering iron called the TS210, which uses JCB style c210 cartridges. I just got one and it's pretty nice, but it would be even better with IronOS on it...

I don't know for sure, but I think it might use a RISC-V processor.

[StevenSeifried]

There is already an issue about it
#2122