sim

refactor: (BitcoinRBF-Step2): some minimum code refactoring for Bitcoin RBF adoption #1402

Job	Run time
changed-files	7s
matrix-conditionals	3s
test-sim-fullappsimulation / sim	58s
test-sim-nondeterminism / sim	34s
test-sim-after-import / sim	1m 29s
test-sim-import-export / sim	58s
sim-ok	1s
	4m 10s

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