Fixed lighting artifacts caused by untransformed normals, added 'Scene' for holding objects for rendering, added turn table models to menus using a scene, misc other changes.

lib/scene.rb

@@ -0,0 +1,22 @@
+class IMICFPS
+  class Scene
+    attr_reader :camera, :entities, :lights
+
+    def initialize
+      @camera = Camera.new(position: Vector.new)
+      @entities = []
+      @lights = []
+
+      setup
+    end
+
+    def setup
+    end
+
+    def draw
+    end
+
+    def update(dt)
+    end
+  end
+end