0.9.1 4800 baud and layout 0x35

- when switching dipswitches 4 and 5 next to the RAM, 4800 baud is used
- layout 0x35 is one in front full size, then two behind, above one another

0.9.0 also configure via MQTT

- topic=bus_panel/message
- input by json format
- code cleanup and inline comments

0.0.7 menu based options for display

- single key menu choice
- direct ascii to command values
- targets known sequences

0.0.6 add cli coding input

- payload[6] will be set with hex input
- this drives the size and thickness of the font

0.0.5 allow cli number input

- push this to a display message

0.0.4 use ota_string

- sets mqtt-uri
- and ping_target
- and target display

0.0.3 introduce MQTT subscriber

- topic bus_panel/message
- broker via CLI

0.0.2 moved to UART driver, not I2S

- turns out to be sufficient for this purpose
- copy from Quatt-Modbus repository
- reuse the setup for UART to do TX
- adjust for busdisplay 600-8E1
- add checksum function
- inherits LCM4ESP32, UDPlogger, pinger, SNTP