Cardreader: Switch card power in software
Cardreader: Cleanup some dead code
Cardreader: Change IO Pins and Clockgen Timer to match new hardware.
Cardreader: Update LCD lib and set 4 bit mode pins.
Cardreader: Fix racecondition where serial interfaces bytes can get lost while processing an LCD command. The sender will now be notified when the commadn is complete.
Control: Support low battery shutdown override in new UPS.
Control: Support diabling keyslots
Control: Re-enable IDLE sleep mode.
Control: Change Cardreader power request pin polarity (high = power needed)
Control: Support RNG power software control (currently always on, to be changed).
Control: Update shell help command, to list all commands.