Verify that the updated masters are correct

[asklar]

We weren't failing the PR/CI builds when tests failed. As a result the output xaml tree has drifted from the masters we once had. I've changed the masters to match what we output now (i.e. re-baseline), but component owners should verify that the behavior the masters describe is the one we want, and if not, fix the code (and push new masters). The differences were mostly around sizes and colors of elements - but one that stuck out to me was that ImageRTL has FlowDirection=LeftToRight, I'm not sure how it's supposed to work but hopefully someone does :)

[chrisglein]

Apparently that example (the RTL one) is correct, as the image shouldn't be flipped.
The color ones are worth investigation.

[chrisglein]

Worth investigating:

• Control size differences
• Scaling differences Scaling is wrong in RNW, possible Yoga issue #4619
• Differences depending on release/flavor E2ETest failure: Padding doesn't work for Views on VS 2019, v142 tools, Release x64 #4122

Accent color has been handled.

Let's get to an itemized list here with issues tracking each.