Remove unused files

src/main/scala/scene/Scene.scala

-package Scene
-
-import Component.*
-
-trait Scene:
-    var components: List[Drawable] = List()
-
-    protected def addComponent(component: Drawable): Unit =
-        // TODO: Add z-index
-        components = components ::: List(component)
-
-    def load(scene: Main.Game): Unit

src/main/scala/scene/Sprite.scala

-package Scene
-
-import Component.*
-import SFML.Graphics.Texture
-
-class Sprite(texture: Texture) extends DrawableTexture(texture):
-    def init() = ()
-    def update(game: Main.Game) = ()

src/main/scala/scene/Text.scala

-package Scene
-
-import Component.*
-import SFML.Graphics.Font
-
-class Text(font: Font) extends DrawableText(font):
-    def init() = ()
-    def update(game: Main.Game) = ()