Make RS485Class a configurable argument for ModbusRTU*

[facchinm]

Can be changed by either the constructor or begin()

Ports and replaces #14

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[github-actions]

Memory usage change @ 1c51a13

Board	flash	%	RAM for global variables	%
arduino:avr:leonardo	🔺 +150 - +208	+0.52 - +0.73	🔺 +4 - +57	+0.16 - +2.23
arduino:mbed:envie_m7	0 - 0	0.0 - 0.0	🔺 +8 - +8	0.0 - 0.0
arduino:mbed:nano33ble	💚 -64 - 0	-0.01 - 0.0	🔺 +8 - +8	0.0 - 0.0
arduino:megaavr:uno2018:mode=off	🔺 +146 - +206	+0.3 - +0.42	🔺 +4 - +31	+0.07 - +0.5
arduino:samd:mkrwifi1010	🔺 0 - +8	0.0 - 0.0	🔺 +8 - +8	+0.02 - +0.02

Click for full report table

Board	examples/RTU/ModbusRTUClientKitchenSink flash	%	examples/RTU/ModbusRTUClientKitchenSink RAM for global variables	%	examples/RTU/ModbusRTUClientToggle flash	%	examples/RTU/ModbusRTUClientToggle RAM for global variables	%	examples/RTU/ModbusRTUServerKitchenSink flash	%	examples/RTU/ModbusRTUServerKitchenSink RAM for global variables	%	examples/RTU/ModbusRTUServerLED flash	%	examples/RTU/ModbusRTUServerLED RAM for global variables	%	examples/RTU/ModbusRTUTemperatureSensor flash	%	examples/RTU/ModbusRTUTemperatureSensor RAM for global variables	%	examples/TCP/EthernetModbusClientToggle flash	%	examples/TCP/EthernetModbusClientToggle RAM for global variables	%	examples/TCP/EthernetModbusServerLED flash	%	examples/TCP/EthernetModbusServerLED RAM for global variables	%	examples/TCP/WiFiModbusClientToggle flash	%	examples/TCP/WiFiModbusClientToggle RAM for global variables	%	examples/TCP/WiFiModbusServerLED flash	%	examples/TCP/WiFiModbusServerLED RAM for global variables	%
arduino:avr:leonardo	150	0.52	4	0.16	150	0.52	4	0.16	150	0.52	4	0.16	150	0.52	4	0.16	178	0.62	4	0.16	208	0.73	57	2.23	208	0.73	57	2.23
arduino:mbed:envie_m7	0	0.0	8	0.0	0	0.0	8	0.0	0	0.0	8	0.0	0	0.0	8	0.0	0	0.0	8	0.0
arduino:mbed:nano33ble	0	0.0	8	0.0	0	0.0	8	0.0	-64	-0.01	8	0.0	-64	-0.01	8	0.0	0	0.0	8	0.0
arduino:megaavr:uno2018:mode=off	146	0.3	4	0.07	146	0.3	4	0.07	146	0.3	4	0.07	146	0.3	4	0.07	170	0.35	4	0.07	186	0.38	31	0.5	206	0.42	31	0.5	194	0.4	31	0.5	186	0.38	31	0.5
arduino:samd:mkrwifi1010	0	0.0	8	0.02	0	0.0	8	0.02	0	0.0	8	0.02	0	0.0	8	0.02	0	0.0	8	0.02	8	0.0	8	0.02	8	0.0	8	0.02	8	0.0	8	0.02	8	0.0	8	0.02

Click for full report CSV

Board,examples/RTU/ModbusRTUClientKitchenSink<br>flash,%,examples/RTU/ModbusRTUClientKitchenSink<br>RAM for global variables,%,examples/RTU/ModbusRTUClientToggle<br>flash,%,examples/RTU/ModbusRTUClientToggle<br>RAM for global variables,%,examples/RTU/ModbusRTUServerKitchenSink<br>flash,%,examples/RTU/ModbusRTUServerKitchenSink<br>RAM for global variables,%,examples/RTU/ModbusRTUServerLED<br>flash,%,examples/RTU/ModbusRTUServerLED<br>RAM for global variables,%,examples/RTU/ModbusRTUTemperatureSensor<br>flash,%,examples/RTU/ModbusRTUTemperatureSensor<br>RAM for global variables,%,examples/TCP/EthernetModbusClientToggle<br>flash,%,examples/TCP/EthernetModbusClientToggle<br>RAM for global variables,%,examples/TCP/EthernetModbusServerLED<br>flash,%,examples/TCP/EthernetModbusServerLED<br>RAM for global variables,%,examples/TCP/WiFiModbusClientToggle<br>flash,%,examples/TCP/WiFiModbusClientToggle<br>RAM for global variables,%,examples/TCP/WiFiModbusServerLED<br>flash,%,examples/TCP/WiFiModbusServerLED<br>RAM for global variables,%
arduino:avr:leonardo,150,0.52,4,0.16,150,0.52,4,0.16,150,0.52,4,0.16,150,0.52,4,0.16,178,0.62,4,0.16,208,0.73,57,2.23,208,0.73,57,2.23
arduino:mbed:envie_m7,0,0.0,8,0.0,0,0.0,8,0.0,0,0.0,8,0.0,0,0.0,8,0.0,0,0.0,8,0.0,,,,,,,,
arduino:mbed:nano33ble,0,0.0,8,0.0,0,0.0,8,0.0,-64,-0.01,8,0.0,-64,-0.01,8,0.0,0,0.0,8,0.0,,,,,,,,
arduino:megaavr:uno2018:mode=off,146,0.3,4,0.07,146,0.3,4,0.07,146,0.3,4,0.07,146,0.3,4,0.07,170,0.35,4,0.07,186,0.38,31,0.5,206,0.42,31,0.5,194,0.4,31,0.5,186,0.38,31,0.5
arduino:samd:mkrwifi1010,0,0.0,8,0.02,0,0.0,8,0.02,0,0.0,8,0.02,0,0.0,8,0.02,0,0.0,8,0.02,8,0.0,8,0.02,8,0.0,8,0.02,8,0.0,8,0.02,8,0.0,8,0.02