Migrate shield with depth to Bevy 0.11

[marko-lazic]

There are a lot of examples and it might be simpler to get them to work with Bevy 0.11 one by one. This issue is regarding one of the coolest, the shield-with-depth example.

It depends on

• bevy_basic_camera
• bevy_prepass_debug
• bevy_shader_utils

So in total four crates need to be touched. We could migrate them to get to work with Bevy 0.11 and any other improvements such as enabling prepass motion vector would be left as future enhancements.