CardReader, Control: Change Polarity of Card-Detection / Reader-Power-Request pin to match the final hardware.

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.

Control: Add support for shutting down the cardreader power completely when on battery and no card is in the reader.

Rework of card reader protocol and code. It now uses a generic transport protocol with error checking (CRC16).
Rework card reader interface, it now drives the LCD and card remotely.
Switch key storage to external EEPROM.
Cache only the first 4 byte of key hashes in RAM, not the full hash.
Replace old single char commands with a management CLI. Currently a hardcoded login is used. This is subject to change.
Use an external hardware RNG for random numbers. Thanks to StuC for building this nice piece of Hardware.
Disable power save modes for now.
Enable Brown out detection to avoid accidental door commands on power fail
Update schematics.

Control: Regenerate salt after 3 tries.
Control: Add timeout to auth.
Control: Set KEY_COUNT to 32. Thats all that fits in the internal EEPROM.

PortalControl: Switch external crystal back on.
Reorganize directory structure.

Setup power supply for Auth-System and Keymatic immediatly after powerup/reset. Implement commands and a button to change power supply state.

Rework state handling. Don't try to interpret hardware states more than needed. Add software state flags to represent what the system is currently doing.

Permanently enable Alarm pin instead for use with a fixed frequency beeper instead of a (piezo) speaker. Use freeed AVR Timer to move door command waits into background.

100ms was too small for the real hardware.

Currently using PD2