Pinebook Pro Revised Keyboard Firmware

[jackhumbert]

For folks that want to mess around with the keymap (and are brave!) I've converted the revised firmware changes to c source code and created something that allows you to dive into the world of custom keymaps! On the `c_source` branch, the instructions can be found here: https://github.com/jackhumbert/pinebook-...rmware/src - if you're cloning it, you'll need to checkout that specific branch. Both defaults (ANSI and ISO) have been tested, and I'm currently using the jack_ansi keymap on my PBP