Included in the initial implementation is an entity browser which lists all entities in the client ECS, an entity component viewer which shows select components belonging to the selected entity including character state information, and a simple frame time graph.
This MR also includes an extraction of the animation hot reloading code which has been reused for egui to allow for hot-reloading of the egui interface to allow rapid development of the UI with realtime feedback upon save as is the case with aninmations. This is feature-gated behind the `hot-egui` feature which is not enabled by default due to the extra startup time that it adds.
- Implements mesh generation for cylinders and lines.
- Implements an Id-allocator so that clients can mutate positions efficiently.
- Is split into pipeline and scene modules.
- Contains simple shaders that just pass through a position and color.
