- added support for FUNC_DISPLAY_DIM
- added new FUNC_DISPLAY_BLINKRATE with new command DisplayBlinkrate
Value is not being persistently stored, so no seting req.
- added SevensegLog for DisplayMode 1..5 support, displaying the
nth sensor value to nth atached 7-segment display.
For that unsed display adresses before the first one being used
may not be zero, but must be configured to unused addresses
(e.g. 0xFF), otherwise driver init will fail.