One-Shot Replace-By-Fee-Rate

tl;dr: we can solve Rule #3 transaction pinning attacks by simply replacing based on fee-rate, if the old transaction wasn't going to be mined in the next block or two, and the new transaction will be.

This _is_ incentive compatible, because it makes more sense to make money now with a high fee rate transaction than to favor a transaction of lower fee rate that may never even be mined.

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