Tons of experimental updates.

scenes/scene.go

@@ -0,0 +1,9 @@
+package scenes
+
+import "github.com/hajimehoshi/ebiten/v2"
+
+type Scene interface {
+	Update() error
+	Draw(screen *ebiten.Image)
+	Layout(outsideWidth, outsideHeight int) (screenWidth, screenHeight int)
+}