10.7/8: Simplify context URL for "all operations in schema"

The context URL for a structured instance or collection of structured instances mirrors the $select query option used to request that representation. It already supports the * operator to express "all structural properties". It currently lacks the namespace.* operator to express "all actions and functions from a certain namespace".

Adding this would drastically reduce the size of the context URL, especially if using an alias instead of the fully qualified namespace.

Typical use would be self.* with "self" being the alias for the service's namespace (note: "self" is just an example, not even a convention).