Improve Samples in Media

[Arlodotexe]

[Arlodotexe]

In #151, we ported all existing samples for the Media package from the 7.x sample app. This included samples for Shadows and EffectAnimations, but not for Brushes, Effects, or Pipelines.

We have users asking for samples on how to use things like TilesBrush, and so we should add them to the gallery. Additionally, for components without tests, this gives us a simple way to ensure these tools work as expected.

I've reopened this issue so we can add samples for the following:

• Brushes
• Effects
• Pipelines