Implement hitbox viewer (#81)

Reviewed-on: #81
Co-authored-by: Álex Román Núñez <eirexe@eirteam.moe>

src/bin/hitbox-editor.rs

@@ -0,0 +1,37 @@
+use bevy::{
+    asset::{AssetMode, AssetPlugin},
+    gltf::GltfPlugin,
+    image::{ImageAddressMode, ImagePlugin, ImageSamplerDescriptor},
+    prelude::*,
+};
+use bevy_egui::EguiPlugin;
+use clap::Parser;
+use shinespark::hitbox_viewer::{HitboxViewerArgs, HitboxViewerPlugin};
+
+fn main() -> AppExit {
+    let args = HitboxViewerArgs::parse();
+    let default_sampler = ImageSamplerDescriptor::linear()
+        .set_address_mode(ImageAddressMode::Repeat)
+        .set_anisotropic_filter(16)
+        .clone();
+    let default_plugins = DefaultPlugins
+        .set(ImagePlugin {
+            default_sampler: default_sampler.clone(),
+        })
+        .set(GltfPlugin {
+            default_sampler,
+            ..default()
+        })
+        .set(AssetPlugin {
+            mode: AssetMode::Processed,
+            use_asset_processor_override: Some(cfg!(feature = "development")),
+            ..default()
+        });
+
+    App::new()
+        .add_plugins(default_plugins)
+        .add_plugins(EguiPlugin::default())
+        .insert_resource(args)
+        .add_plugins(HitboxViewerPlugin)
+        .run()
+}