Add a connector for external, touch buttons

[medisoft]

It would make sense to put some jst 1.25 connectors for the buttons. So we can add a capacitive touch buttons, allowing to build enclosures that are fully water protected.

Maybe also to submerge all the device in transparent resin, making it very water proof!

With the addition of wireless charging and a firmware partition in case of failed OTA, that would make the device a lot more complete!