[TODO]: Cleanup models.py

[CoMPaTech]

Todo

Follow-up from #1 merge, as per @bouwew comments

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custom_components/plugwise_usb/models.py

• L28-31 This part is no longer needed after the split.

Also below all plugwise_api=STICK, lines can be removed.

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• L35-36 Rewrite to class PlugwiseEntityDescription(EntityDescription):

Or remove this class and rename below classes to SensorEntityDescription, etc.

Maybe even better, move all descriptions (back) into the relevant files, as done in Core Plugwise

[dirixmjm]

models.py is no longer part of the integration.