Pass the read-only kernel functions generically.

They all pass straight through so there is no need to handle each one
separately to be able to reinterpret the arguments.
Finish `kernel.prototypes( ..., includeBehaviors )`.
Kernel documentation updates.
Register nodes with the kernel before `creatingNode` rather than during.

The kernel delegates node metadata, such as the name, source/type
fields, and the prototype and behaviors lists, to vwf/model/object. But
since vwf/model/object is the last driver, relying on the normal order
for `creatingNode` prevented other drivers from asking about prototypes
and other node information in their `creatingNode` handlers.
Clean up nodes between tests.
Hide references to ancestors from uninitialized nodes in applications.
Accept `undefined` for `rootID`.
Add `kernel.application` to identify the application node.

Removes `index-vwf` references from the kernel and drivers and should
allow any remaining assumptions about the `index.vwf` application name
to be removed.

Closes #1748.
Remove obsolete, unused `useLegacyID` conditions.