* Added widgets.rs to egui for reusable widgets
* Added filterable_list egui widget
* Reworked DebugShapeAction to be a more generic EguiAction which now allows for ChatCommands (used by admin tools) as well as DebugShape drawing requests.
* Fixed egui event handling so that typing/clicking within egui windows now correctly doesn't pass these events onto the game itself
* Removed /give_item limit for stackable items
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.
