Demo CLI

I added a demo CLI (you can see it on the screenshot) where you can exit properly, run tests or view the old demo!

Keyboard driver

I had to fix some bugs with the keyboard driver, but now I think it works okay enough that the CLI is stable (previously, it kept parts from the old buffer when reading it again)

Road map

I want to add more features to the CLI, such as setting the log level. As you can see on the screenshot, the debug output disturbs the CLI.