Common reorg (#8025)

* Re-organize common folder

* fix: Correct paths in tests

* fix: move new content to proper folder

* chore: Move audio folder to assets

* Move sprites to sprites assets directory

* Move css sprites to assets directory

* Split out readmes for common code and sprites

* Move images to assets directory

* Move destinatin of shared browserified file

* remove unused file

* move compiled js to client-old

* Fix karma tests

* fix: Correct paths for sprites

website/common/script/content/appearance/prefill.js

@@ -0,0 +1,11 @@
+import {forOwn} from 'lodash';
+
+module.exports = function prefillAppearances (obj) {
+  forOwn(obj, function prefillAppearance (value, key) {
+    value.key = key;
+    if (!value.price) {
+      value.price = 0;
+    }
+  });
+  return obj;
+};