Add metadata describing that we have deprecated:

1) Resources
2) Attributes
3) Operations
4) Operation parameters

We'll need to sort out exactly what info to provide. We can declare in what management API version an item was deprecated, and provide some localized text explaining. More problematic would be info on what "version" the item will be removed in (outside of vague wording in the description text). Probably including such info would be a mistake; prone to error.