Maintenance patches applied to branch 1.1

[phet-dev]

This branch (1.1) had changes related to the following applied:

• fix for iOS 13 Full Screen, see iOS 13 Full Screen enabled phet-core#64
• iPadOS 13 highlighting behavior scenery#1006

Presumably one or more of these changes is likely to have been applied after the last RC version, and should be spot-checked by QA in the next RC (or if it was ready for a production release, an additional spot-check RC should be created).