Allow controlling the color temperature via features interface:
```
$ kasa --host 192.168.xx.xx feature color_temperature
Color temperature (color_temperature): 0
$ kasa --host 192.168.xx.xx feature color_temperature 2000
Setting color_temperature to 2000
Raised error: Temperature should be between 2500 and 6500, was 2000
Run with --debug enabled to see stacktrace
$ kasa --host 192.168.xx.xx feature color_temperature 3000
Setting color_temperature to 3000
$ kasa --host 192.168.xx.xx feature color_temperature
Color temperature (color_temperature): 3000
```
