Some isolators depend on other isolators. However, we currently do not have a generic method of expressing these dependencies. We special case the `filesystem/*` isolators to make sure that dependencies on them are satisfied, but no other dependencies can be expressed.
Instead, we should use a vector to represent the pairing of isolator name to isolator creator function. This way, the relative dependencies between each isolator will be implicit in the ordering of the vector. Currently, a hashmap is used to hold this pairing, but this is inadequate because hashmaps are inherently unordered. The new implementation using a vector will ensure everything is processed in the order it is listed.