Reorganized file tree, made Checkerboard a child of Layer

js/File.js

@@ -0,0 +1,12 @@
+// A file has layers
+    // It probably contains the LayerList, which should include the layers array
+// A file contains sprite scaling and canvas resizing
+
+/*
+    let canvasSize
+    let canvasView
+    let layerList
+
+    resizeCanvas()
+    scaleSprite()
+*/