Support rmate protocol

[dwt]

Check for existing issues

• [X] Completed

Describe the feature

This was already mentioned as part of the remote development ticket but the feature is much too important to be sidelined by that discussion.

The rmate protocol is very simple, it means listening on localhost on a specific port, and supporting a very small protocol to receive textiles to edit over it. This allows very simple remote work via ssh while editing the files in the comfort of the local editor with local plugins / shortcuts / everything.

• The original implementation is here
• A shell only implementation is here
• The VSCode rmate plugin lists several more versions of rmate

If applicable, add mockups / screenshots to help present your vision of the feature