include a keyboard officially in the firmware

k3yboard is a good contender, and should prob be included as an official library after some cleanup.

I think one of the key things to add is a good way to get in and out of it without having issues with on_enter/on_exit being triggered? I think I might provide some utils or some optional flags on on_enter/on_exit for this purpose before we can use k3yboard for this purpose.

general purpose k3yboard todo list from my discussions with the dev btw:

• ability for the app requesting k3yboard to set the character sets for entry
• better use of the screen real estate with regards to the visibility of the text being entered
• title for what is being entered
• "swipe mode": "toggle through the characters by swiping instead of tapping the petal. Not sure how well this would work, could be a configurable option."
• optionally a mode to hide input by displaying * characters