add board that takes power from a terminal block and uses a Pololu step-down voltage regulator

Add symbol and footprint libraries for Pololu voltage regulators

Upgrade to KiCad 5.99

qwiic power c single: update

qwiic power micro double: update

qwiic power micro single: update

lifepo4 14500: update?

lifepo4 14500: replace RocketScream power symbols with KiCad's own

Qwiic power C single/double: add variants of Qwiic power micro single/double with a USB-C port instead of micro

Qwiic power micro single/double: go back to single layer with split VBUS/+3V3/GND areas