Feature/dmsgpty url commands

[mrpalide]

Fixes #_

Changes:

• add urlCommands function to get commands parameter from pty URL like:
  http://localhost:8000/pty/0224b07107e368e0e58447ed6742b274a797f0cdce4996accb4f2ed7fcc86f06e7?commands=ls,pwd,update
• each command should separated with , value
• update command automatically replace with sudo apt update && sudo apt install skywire-bin -y, but other commands run as it put there.
• ui_html.go gzip hex data changes. It created from this html file with added +location.search to line 10 for WebSocket value. Means changed to new WebSocket(protocol+"://"+location.host+location.pathname+location.search);
• our modified term.html file is on scripts folder of our repo

How to test this PR:

• clone dmsg on this PRs branch
• clone skywire at develop
• uncomment replace dmsg... on go.mod in skywire and make dep
• make build and run visor
• open full terminal of running visor
• add some commands at related url like ?commands=ls,pwd,update
• check dmsgpty for commands

Screencast:

dmsgpty.mov