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Summary:
Many UIAppearance calls do not work in tvOS 10

In tvOS 9, I was able to say:

`UITabBar.appearance().backgroundColor = UIColor.green`

and the tab bar background would be green. In tvOS 10, this does not work.

Steps to Reproduce:
See attached project, or do the following:

1. Create a new tvOS project using the Tab
2. In AppDelegate.swift, in application(application:didFinishLaunchingWithOptions), add the following:
    UITabBar.appearance().backgroundColor = UIColor.green
    UILabel.appearance(whenContainedInInstancesOf: [FirstViewController.self]).textColor = UIColor.red
3. Run the app in the tvOS 9.2 simulator
4. Notice the tab bar background is green and the labels are red
5. Run the app in the tvOS 10.0 simulator
6. Notice the labels are still changed to red, but the tab bar background is unchanged.

Because of these, much of my theming in my tvOS apps is broken. This is causing text to be invisible in UINavigationBar and UITabBar because both the text and background are getting set to black.

Expected Results:
I expect all calls to UIAppearance that worked in tvOS 9 to work in tvOS 10

Actual Results:
Some UIAppearance calls do not work.

Version:
tvOS 10.0

Configuration:
tvOS Simulator, Apple TV 4