Add option to not run simulations when converting snapshots #128

Job	Run time
bump-dev-version	0s
update-core-files / update-core-files	45s
test-coverage / test-coverage	6m 21s
R-CMD-Check / windows-latest (release)	12m 10s
R-CMD-Check / ubuntu-latest (release)	8m 51s
pkgdown / pkgdown	5m 53s
	34m 0s

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