Firmware Release Notes SW01810-2.0.4.0

Supported products:
R-KEY-LT-P (Rev. D0)
Z-KEY-P (Rev. F0)
Z-KEY-P (Rev. F1)
Z-KEY-2ETH-P (Rev. B0)

NEW:
- Implementation of new operation modes: "GATEWAY PROFINET IO DEVICE/ MODBUS MASTER" and "GATEWAY PROFINET IO DEVICE/ MODBUS SLAVE".
- TAG mode performance improvement 
- Added and updated Excel and GSDML templates for each mode of the new firmware