Attack system revamp (#82)

- Add crouch cancelling
- Add IASA for aerial attacks
- Add scaffolding for autocancel
- Add hitbox group system
- Add new ergonomic features for attack scripting
- Add more information to the hitbox viewer
- Improve the looks of debug capsules

Reviewed-on: #82
Co-authored-by: Álex Román Núñez <eirexe@eirteam.moe>

src/egui_color_convert.rs

@@ -0,0 +1,16 @@
+use bevy_egui::egui::Color32;
+
+pub trait ColorToEgui {
+    fn to_egui(&self) -> Color32;
+}
+
+impl ColorToEgui for bevy::color::Srgba {
+    fn to_egui(&self) -> Color32 {
+        Color32::from_rgba_unmultiplied(
+            (self.red * 255.0) as u8,
+            (self.green * 255.0) as u8,
+            (self.blue * 255.0) as u8,
+            (self.alpha * 255.0) as u8,
+        )
+    }
+}