Amendment: Allow require aliases to reference other aliases

[vrn-sn]

Enables iterative resolution of chained aliases.

[vrn-sn]

Also want to add that cycle detection is relatively simple and inexpensive.

This stems from the fact that dependency aliases must always be defined in the same or a higher-level .luaurc than dependent aliases. If defined higher, however, it is impossible to "complete" the cycle, as the higher-defined aliases cannot depend on aliases defined at lower levels (follows directly from the search semantics).

From that, it's easy to see that the only way for a cycle to occur is if all aliases in the cycle are defined in the same .luaurc file.