GPII-115: Registry resolver support

Replaces: https://github.com/GPII/windows/pull/28

I've left in the old demand block as comment for reference, should be removed before merge.

This pull request requires the "fluid.applyGradeLinkage" to be added to LifecycleManager.js -- this has been done in https://github.com/GPII/universal/pull/145 - and this includes as well a means of testing whether it's working (requires NVDA installed on the machine)