Combine DPTBinary and DPTArray

[farmio]

Combine DPTBinary and DPTArray to one Class (e.g. "DPTPayload") with an attribute payload_length.
payload_length == 0 would indicate DPTBinary style encoding in the CEMI Frame.

This would save a lot of typing headaches 🤪

Maybe even use bytes instead of tuple as value to coerce its value < 256

[github-actions]

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