This commit changes the selected text background color to a more
contrasting one. It also unifies colors of focused/not focused editor.
Focused editor is now indicated by the blinking cursor, which is a
more popular solution.
* adding columnify and ember-cli-cjs-transform
* add yargs-parser
* remove vendored yargs-parser tokenizer and use cjs transform to import it from actual yargs-parser
* add clear command that clears the log, but maintains history
* make codemirror have no gutter and be auto-height when rendered in the console output log
* add fullscreen command and hook up fullscreen toggle button
* hook up copy button
