Import c9cdfa48c9: Ambient Maps get high load priority treatment like skyboxes already do (by Caitlyn)

This is an automated proposal to look at a commit made by Caitlyn and import it into Overte

Commit:	c9cdfa48c92e424807d6a483e83d0240d859c42d
Author:	Caitlyn
Date:	Sat, 14 Mar 2020 14:19

Ambient Maps get high load priority treatment like skyboxes already do

Stats:

Filename	Stats	Lines	Added	Removed	Lines in blame
libraries/material-networking/src/material-networking/TextureCache.cpp		9	7	2	7
1 files	-	9	7	2	7

To work on this, please assign the issue to yourself, then look at the commit and decide whether this would be a good addition to Overte.

If the commit is useful, tag it with "Tivoli: Keep", and keep it open until it's merged.
If the commit is not useful, tag it with "Tivoli: Discard", and close it.
If the commit is not useful right now, but might be later, tag it with "Tivoli: Maybe later", and close it.
If it's hard to decide, tag it with "Tivoli: Discuss", and keep it open.

Useful commits should be submitted as a PR against Overte. Tag this issue in PR, so that it's automatically closed once the PR is merged.

You can cherry-pick this issue with this command:

git cherry-pick c9cdfa48c92e424807d6a483e83d0240d859c42d

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