adds payloadCapacity sensor for logic, which senses unit payload capacity in block squared (mega = 4, quad = 9, etc.)
so people (which includes me) don't have to hardcode a payload logic again, I don't know too why this hasn't been added, it gives so much potential to those logic abusers

it's me with another PR again don't get annoyed

TODO:

• sometimes it's too precise on imperfect payload number, like oct, in the database, it's showned as 28.09, but in the logic, it's showned as 28.095002059936523, literally.
• if above is checked out, I might remove the 8 check, as it'll get rounded/truncated to 0 anyways (or not?) use Payloadc check, thanks to MrDuck557 for telling me that.

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