dev/core#2117 - Resources - Allow each snippet to have `aliases`

dev/core#2117 - Resources - Allow each snippet to have `aliases`

__Before__: Every snippet/resource has a singular name. If the name ever changes,
it becomes a backward-compatibility break.

__After__: Every snippet/resource has a singular name, and it may optionally
have a list of aliases.  If the name ever changes, you can leave an alias
for backward-compatibility.