New protocol decoder: sda2506

lisigrokdecode has recently gained support for yet another protocol decoder: sda2506.

This PD decodes the Siemens SDA 2506-5 serial nonvolatile 1-Kbit EEPROM protocol.

This is a non-standard EEPROM (i.e., not one of the common I²C based 24xx series EEPROMs).

As usual there are a few example files in the sigrok-dumps repo and some test-cases in sigrok-test.

The decoder was contributed by Max Weller, thanks a lot!