Allow all sensors to be persistent and not just input_boolean

[francisp (Francis)]

@wills106

PowerRetain 1, SwitchRetain 1 and SensorRetain 1

These settings apply to the sonoff bridge itself, not to messages recieved from the bridge. If you want to retain the status across HA restarts, use the demux script. see this topic :

Sonoff RF Bridge. Strategies for receiving data

Here are two strategies for receiving payloads published by a Sonoff RF Bridge (flashed with Tasmota firmware). Strategy 1: value_template In this strategy, all sensors are subscribed to the same topic published by the RF Bridge. The topic's structure depends on how you defined it when you configured *your* RF Bridge. This example will use `tele/RF_Bridge/RESULT`. Change that to whatever you have set for your Bridge. Because all sensors are subscribed to the same topic, a sensor will receive pa…