Upgrade to Bevy 0.9

[ChristopherBiscardi]

Major changes were

• spawn_bundle -> spawn
• view.width to view.viewport.z and view.height to view.viewport.w in wgsl shaders
• watching for changes now uses the new Plugin settings support

      .add_plugins(DefaultPlugins.set(AssetPlugin {
          watch_for_changes: true,
          ..default()
      }))

• time.elapsed_seconds is the new name for seconds_since_startup
• pbr_input.N when cloning standard material functionality in shaders is now

          pbr_input.N = apply_normal_mapping(
          material.flags,
          pbr_input.world_normal,
  #ifdef VERTEX_TANGENTS
  #ifdef STANDARDMATERIAL_NORMAL_MAP
          in.world_tangent,
  #endif
  #endif
  #ifdef VERTEX_UVS
          in.uv,
  #endif
      );

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time in shaders has not yet been implemented. This is an update to use all relevant 0.9 APIs otherwise.