Being able to identify micro:bit board version

[microbit-carlos]

There is already a "Board Version" property in the JS side that is used to identify the board, but needs be updated for V2.2 support anyway:

microbit-firmata/firmataClient.md

Lines 26 to 30 in 3b057a8

	The following properties provide version information:
	<dl>
	<dt>boardVersion</dt><dd>
	Property. The micro:bit hardware version (currently either 1.3 or 1.5).</dd>

microbit-firmata/client/MBFirmataClient.js

Line 200 in 3b057a8

this.boardVersion = this.boardVersionFromSerialNumber(p.serialNumber);

microbit-firmata/client/MBFirmataClient.js

Lines 231 to 240 in 3b057a8

	boardVersionFromSerialNumber(usbSerialNumber) {
	// The micro:bit board version can be determined from the USB device serial number.
	// See https://support.microbit.org/support/solutions/articles/19000084312-micro-bit-motion-sensor-hardware-changes-for-editor-developers
	var id = usbSerialNumber.slice(0, 4);
	if ('9900' == id) return '1.3';
	if ('9901' == id) return '1.5';
	if ('9903' == id) return '2.0';
	if ('9904' == id) return '2.0';
	return 'unrecognized board';
	}

We also need to fix the Firmware Version reported by the firmware programme, as the DAL_VERSION macro does not get a valid version number in CODAL (lancaster-university/codal-microbit-v2#138):

microbit-firmata/firmware/source/mbFirmata.cpp

Lines 310 to 330 in 3b057a8

	static void reportFirmwareVersion() {
	// Send firmware version plus DAL, mbed library, and softdevice version info.
	// The softdevice version can be found by looking up the firmward ID (FWID) here:
	// https://devzone.nordicsemi.com/f/nordic-q-a/1171/how-do-i-access-softdevice-version-string
	// Some Event IDs changed between firmware 1.0 (DAL <= 2.1.1) and 1.1 (DAL >= 2.2.0-rc6 and CODAL)
	// MICROBIT_ID_DISPLAY/GESTURE/IO_P0/IO_P1/IO_P2
	int major = 1;
	int minor = 1;
	char s[100];
	ble_version_t bleInfo;
	sd_ble_version_get(&bleInfo);
	sprintf(s, "[based on DAL %s; mbed %d; softdeviceFWID %d] micro:bit Firmata",
	DAL_VERSION, MBED_LIBRARY_VERSION, bleInfo.subversion_number);
	send2Bytes(SYSEX_START, REPORT_FIRMWARE);
	send2Bytes(major, minor); // firmware version (vs. Firmata protocol version)
	sendStringData((const char *) s);
	sendByte(SYSEX_END);
	}

The "Board Version" property is only provided from the JS firmware library, which uses the USB ID to identify the board.
@JohnVidler we should consider if we also want to provide that info from the micro:bit firmata programme, as it could be included (only as V1 or V2, no need to query DAPLink to identify V2.0 or V2.2) in the "Firmware Version" string form.