* use System.Terminal for "editor" mode (WIP, does not work in POSIX)
* fix getKey - only return one event on control keys
* fix printing with System.Terminal
* different markdown escape for color, added black color
* fix color escapes
* make black invisible
* markdown fixes
* remove Key type, fix editor bug, refactor
* refactor: use getKey in getTermLine
* default mode is "editor", remove windows warning
* markdown: code snippet
* use ! for color markdown
* edit previous input
* clean up
* use getWindowSize from System.Terminal
