feat: update to bevy 0.17 and use individual bevy crates

Signed-off-by: Schmarni <marnistromer@gmail.com>

crates/bevy_openxr/src/openxr/layer_builder.rs

@@ -1,6 +1,6 @@
 use std::mem;
 
-use bevy::ecs::world::World;
+use bevy_ecs::world::World;
 use bevy_mod_xr::spaces::{XrPrimaryReferenceSpace, XrSpace};
 use openxr::{sys, CompositionLayerFlags, Fovf, Posef, Rect2Di};
 
@@ -63,7 +63,7 @@ impl LayerProvider for ProjectionLayer {
 }
 
 impl LayerProvider for PassthroughLayer {
-    fn get(&self, world: &World) -> Option<Box<dyn CompositionLayer>> {
+    fn get(&self, world: &World) -> Option<Box<dyn CompositionLayer<'_>>> {
         Some(Box::new(
             CompositionLayerPassthrough::new()
                 .layer_handle(world.get_resource::<OxrPassthroughLayer>()?)
@@ -171,7 +171,7 @@ impl Default for CompositionLayerProjectionView<'_> {
     }
 }
 /// # Safety
-/// the header function must return a ref to a valid Composition Layer struct. 
+/// the header function must return a ref to a valid Composition Layer struct.
 /// it has to use `repr(C)` and it has to follow the shape of a Composition Layer struct from the
 /// OpenXR specification
 pub unsafe trait CompositionLayer<'a> {