Use snapshot regression tests for sim_*() functions
#65
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This PR updates the regression tests for
sim_linelist(),sim_contacts()andsim_outbreak(), using snapshot testing (testthat::expect_snapshot()) instead of manually checking the type of data structure, column names and dimensions. This change reduces the number of lines of code required to test these functions and should be more strict in catching changes to the contents of the data structures output, which would have been missed by the previous implementation.