BHV-14735: Smartened-up moonstone sampler by keeping a spotlight-able root, and swapping in and out the children.

Enyo-DCO-1.1-Signed-off-by: Blake Stephens <blake.stephens@lge.com>
Merge pull request #1731 from enyojs/BHV-14735-blakestephens

BHV-14735: Smartened-up moonstone sampler by keeping a spotlight-able root

Reviewed-By: Ryan Duffy (ryan.duffy@lge.com)
Integrated-By: Cole Davis (cole.davis@lge.com)