Futures Basis

Futures basis.

Compares BTC futures to a spot index and shows the difference as a percentage.
By default quarterly futures are used, which you'll manually have to update (type new ticker) when the roll happens.
However I'll probably do it myself every time they settle.

You could also use this for futures of a different coin like ETH for example, but then you'll have to change the index which you can do in the settings.

You can also turn on an average calculation of all the futures selected.

Made for friends.

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Title update.

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Couple changes.

You can now exclude certain markets in the input settings.
The average futures basis will now calculate the average only of the markets selected (so it adapts if you exclude markets).

If you want a market to be part of the calculation but you don't want to the line, just turn it off in the style settings (keep it on in the input settings).

Shout-out to @dogepgp for helping me with this.

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Smol convenience update.

It's easier now to switch between all markets and only the average futures basis.

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Okex already rolled over automatically so I updated all the contracts to the next expiry September.