Line editor
X Get crossterm working
X Line input
X Printing a prompt
X Raw input mode
X Backspace
X Exiting
X Arrow key input
X Left/right and inserting text
X Backspace from middle of buffer
X Deleting from middle of buffer
X Fixed the scroll-off-the-bottom issue
* Editing engine
X Create the engine
X Initial commands for the engine
X Output commands from engine to the line editor
* UTF-8 support
X Line buffer
X Backspace/delete
X Navigation
X Unicode w/ joiner support for removal
* Multiline editing
X History
X Up/down history
X Home/end
X Refactor keypresses to flush at the end
X Ctrl-A, Ctrl-K, etc
X More Ctrl-??? key combinations
X "engine"?
X Command pattern
X Split off lib
* Split Engine into its isolated parts
* History
* Maybe cut buffer. Question: do we want to connect to the OS's clipboard?
* Validation
* Autocompletion
* Make Prompt trait and make prompt configurable
* Multiline support
* Syntax highlighting
* Under status
* Hinting
* vi mode
* Async/parallel prompt