Version 2.1.0

feat: Add support to receive and monitor itho RF-RFT and RF-RV remotes.
feat: Add possibility to join devices (by join command or manually) to the lib and keep track of commands and values (co2, humidity, temp, battery)

New lib functions:

Manually add devices to the known devices list by ID:
bool addRFDevice(uint8_t byte0, uint8_t byte1, uint8_t byte2);
bool addRFDevice(uint32_t ID);

Manually remove devices to the known devices list by ID:
bool removeRFDevice(uint8_t byte0, uint8_t byte1, uint8_t byte2);
bool removeRFDevice(uint32_t ID);

Check is device is known by ID:
bool checkRFDevice(uint8_t byte0, uint8_t byte1, uint8_t byte2);
bool checkRFDevice(uint32_t ID);

Allow (true/false) if devices are allowed to join (standard value: true):
void setBindAllowed(bool input);

Get join allowed status:
bool getBindAllowed();

Receive and handle all devices (standard value: true, for backwards compatibility)
void setAllowAll(bool input);

Get allowed all devices status:
bool getAllowAll();

Get reference to struct which contains all remotes and last known data (co2, temp etc.)
const struct ithoRFDevices &getRFdevices() const;

Sample code to walk to data and create a JSON:

```
  DynamicJsonDocument doc(2000);
  JsonObject root = doc.to<JsonObject>();

  const ithoRFDevices &rfDevices = rf.getRFdevices();
  for (auto& item : rfDevices.device) {
	if (item.deviceId != 0) {
	  char buf[10];
	  snprintf(buf, sizeof(buf), "%02X,%02X,%02X", item.deviceId >> 16 & 0xFF, item.deviceId >> 8 & 0xFF, item.deviceId & 0xFF);
	  JsonObject nested = root.createNestedObject(buf);
	  nested["lastcmd"] = item.lastCommand;
	  if (item.co2 != 0xEFFF) {
		nested["co2"] = item.co2;
	  }
	  if (item.temp != 0xEFFF) {
		nested["temp"] = item.temp;
	  }
	  if (item.hum != 0xEFFF) {
		nested["hum"] = item.hum;
	  }
	  if (item.dewpoint != 0xEFFF) {
		nested["dewpoint"] = item.dewpoint;
	  }
	  if (item.battery != 0xEFFF) {
		nested["battery"] = item.battery;
	  }
	}
  }
```

Example resulting JSON:
```
{"E0,58,45":{"lastcmd":4},"52,4E,9A":{"lastcmd":0},"97,95,A1":{"lastcmd":0,"temp":2079,"hum":52,"dewpoint":1062},"97,28,ED":{"lastcmd":0,"co2":1033}}
```