BREAKING CHANGE: lib will store cached export functions and no longer uses the : syntax to call functions.
Allow SetInterval to return arguments to the callback function.
import now stores all imported modules and uses call and index methods to load modules.
Defining an import as before (local ServerCallbacks = import 'callbacks') works as before, or you can use ServerCallbacks = import.callbacks
You could also use a lazy loading method by never defining ServerCallbacks, i.e. import.callbacks.Register(...) will work without explicitly importing the module previously.
