TS6 Support

[mweinelt]

Adding support for TS6 would allow the appservice to be an actual ircd and bridge users by linking using server to server connections.

https://github.com/charybdis-ircd/charybdis/blob/release/4/doc/technical/ts6-protocol.txt

TS6 is supported by decendants of ratbox, like Charybdis, and a few others. https://github.com/grawity/irc-docs/blob/master/family-tree.txt

I'm unsure how feasible this is, but it would be an interesting extension to make this approach really scalable.

[jansol]

Another possibility would be to implement this in matrix-org/matrix-ircd.