Clean up existing and add range-based closing_signed negotiation#1011

Merged

TheBlueMatt merged 13 commits intolightningdevkit:mainfrom

TheBlueMatt:2021-07-new-closing-fee

Aug 17, 2021

Commits on Aug 17, 2021

Send initial closing_signed message asynchronously and handle errs
TheBlueMatt
committed
Clean up existing and add range-based closing_signed negotiation
TheBlueMatt
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Move shutdown-related tests into a new module
TheBlueMatt
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Force-close if finish closing_signed negotiation takes a full minute
TheBlueMatt
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Add a test for shutdown negotiaion funder restart and timeout
TheBlueMatt
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Slightly clarify the closing_signed error msg on fee mismatch
TheBlueMatt
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Add relatively simple tests of the legacy and target closing fee
TheBlueMatt
committed