Replace vec with slotmap

Add rest of the features

Author: Glyphack

Cargo.lock

@@ -27,6 +27,7 @@ serde = { version = "1.0.219", features = ["derive"] }
 egui_extras = { version = "0.32.1", features = ["all_loaders"] }
 image = "0.25.6"
 egui_logger = "0.8.0"
+slotmap = { version = "1.0.7", features = ["serde"] }
 
 # native:
 [target.'cfg(not(target_arch = "wasm32"))'.dependencies]