This adds the following constraints to the new features:
- Explicit renaming with the `name` property is *only* permitted when
used with the `matrix` property.
- Group does not support either `name` or `matrix` (we may choose to
relax this constraint over time).
- All generated names must be unique.
Signed-off-by: Justin Chadwell <me@jedevc.com>
a1520ea1b2