Dilated Transfer prototyping

[meejah]

Proof-of-concept implementation of the under-discussion "Dilated Transfer" specification (magic-wormhole/magic-wormhole-protocols#23)

• file offers, including multiples supported (e.g. "wormhole send *.md")
• text-messages, either direction (added wormhole receive --stdin to indicate the receiver-side should read stdin -- for the send side it's wormhole send --text -)

(So "text message" mode is basically simple chat).

Doesn't support "directory offers" yet.

[lgtm-com]

This pull request introduces 14 alerts when merging 2d9e585 into e522a39 - view on LGTM.com

new alerts:

• 9 for Unused import
• 3 for Unreachable code
• 2 for Use of the return value of a procedure

[vu3rdd]

I had to pip install the packages msgpack and noiseprotocol. Looking at the setup.py, noiseprotocol is already in the list if dilate flag is given during pip install. Perhaps msgpack also should go in there?

[piegamesde]

@Adrian999999999 please stop spamming

Edit: Okay it's a spam bot, @meejah can you block it from the org maybe?