Update server command interface

[Protonull]

Currently, the MapSync server does some pretty scuffed things to implement an interactible terminal. There are some approaches to this, like using blessed (or something like it) to create a TUI, but I think an easier and less complex approach is using the preexisting HTTP server to local-only serve some kind of dashboard, even if it's as simple as a chat/terminal interface.

[Protonull]

This could also be ameliorated by adding client commands, though it'd be somewhat more complicated since MapSync allows multiple sync connections, so we'd probably need some custom version of the chat screen but for individual sync connections.