Replace hterm with Xterm.js (butlerx#29)

* switch too xterm and webpack

* handle disconects clearner

* stop browser from over rulling ctrl+shift+c

* update pkg.json

* replace log statements with events

* restructure cli

* reduce use of shared state

* remove ssh wrapper

* minify, uglify and tree shake code bundle

* use seperate containers for building frontend

* fit sizing errors

* add helmet

* fix term resize

* add loger

* use custom fix function

* stop server crashing after disconnect

* make better on mobile

* use a pty as a buffer to handle all keyboard keys

* unwrap var

* clean up structure of code

* update readme

* add api

* refactor event emitter

* expand emmitter class

* fix event emitter calls

* format docs

* fix docs

* clean up webpack