Add et (Eternal Terminal) as an alternative to mosh

[phuclv90]

Consider mosh an alternative to ssh that uses UDP, avoiding dropped connections and adding convenience on the road (requires server-side setup).

mosh, screen, tmux... all have their own disadvantages, like no scroll backs or no mouse wheel support (or very inconvenient/unnatural), or difficult to copy texts when splitting panes, or cumbersome to switch between panes. With et those don't exist. It's exactly like using ssh normally in a terminal, just never need to attach, detach or worry about hangups

See https://github.com/MisterTea/EternalTerminal