Add option to not run simulations when converting snapshots #126

Job	Run time
bump-dev-version	0s
test-coverage / test-coverage	6m 6s
R-CMD-Check / windows-latest (release)	12m 5s
R-CMD-Check / ubuntu-latest (release)	8m 38s
pkgdown / pkgdown	5m 25s
	32m 14s

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