Upgrade to Bevy v0.10

This commit implements somewhat minimum number of changes necessary for
transition from Bevy v0.9 to Bevy v0.10. There are no intentional
changes to behavior except of the internal improvements made in Bevy
which constitute positive "side effects" of the upgrade (for example
improvements to rendering or parallel pipelined rendering).

We could drop dependency on iyes_loopless because it was superseded with
new scheduling in Bevy.

Glam was upgraded to match the version used by Bevy.

https://bevyengine.org/learn/book/migration-guides/0.9-0.10/

Relates to DigitalExtinction#324.

CONTRIBUTING.md

@@ -79,7 +79,7 @@
   When the complexity grows, split the system and use events for inter-system
   communication.
 
-* Label struct names end with `Label` (for example `CameraLabel`). Event struct
+* SystemSet enum names end with `Set` (for example `CameraSet`). Event struct
   names end with `Event` (for example `DoubleClickEvent`).
 
 ### Crate Structure
@@ -189,9 +189,9 @@ Topologically sorted crates:
 * [/utils](/utils) — various utilities (e.g. small Python scripts) intended for
   contributors.
 
-### Bevy Schedule Stages
+### Bevy Schedule
 
-See de_core::stages::GameStage.
+See de_core::baseset::GameSet.
 
 ### Coordinate Systems