The rewrite addresses a problem with the tellstick hardware dropping
commands when too many simultaneous calls is being made from HA. Also fixes a bug when the dim level was changed externally.
This breaks previous configurations.
The new config for tellstick is
```yaml
tellstick:
signal_repetitions: X
```
Lights and Switches are detected automatically.
Sensors work like before because they do not share any functionality with the other devices and they also needs a complete other configuration.
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