Enable Bluetooth pairing

[siliconwitch]

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[siliconwitch]

This potentially solves two issues.

1. Encrypting data going over the air so that it can't be sniffed.
2. Preventing attackers from hijacking Monocles.

Number 1) is perfectly doable, however, 2) isn't as easy. There's no real way to repair the monocle after the connection. Usually, this requires a dedicated button. i.e. the attacker would have to physically have the device in order to access it. We could use the touch pads but I can't think of a clean solution there. It might conflict with the startup process.