Move PlatformContext to the raidillon_platform crate

platform/src/context.rs

@@ -0,0 +1,10 @@
+use winit::event::Event;
+use raidillon_assets::ModelManagerRef;
+
+#[derive(Clone)]
+pub struct PlatformContext {
+    pub current_event: Event<()>,
+    pub asset_manager: ModelManagerRef,
+    pub frame_width: f32,
+    pub frame_height: f32,
+}