spesmilo / electrum / 6480237735706624

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CirrusCI

lnworker: use PaymentFeeBudget

- introduce PaymentFeeBudget, which contains limits for fee budget and cltv budget
  - when splitting a payment,
    - the fee budget is linearly distributed between the parts
      - this resolves a FIXME in lnrouter ("FIXME in case of MPP")
    - the cltv budget is simply copied
  - we could also add other kinds of budgets later, e.g. for the num in-flight htlcs
- resolves TODO in lnworker ("todo: compare to the fee of the actual route we found")

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