refactor: move xmodule folder to root

- Moving xmodule folder to root as we're dissolving sub-projects of common folder in edx-platform
    - More info: https://openedx.atlassian.net/browse/BOM-2579
- -e common/lib/xmodule has been removed from the requirements as xmodule has itself become the part of edx-platform and not being installed through requirements
- The test files common/lib/xmodule/test_files/ have been removed as they are not being used anymore

xmodule/js/spec/main_requirejs.js

@@ -0,0 +1,49 @@
+(function(requirejs, define) {
+    'use strict';
+    // We do not wish to bundle common libraries (that may also be used by non-RequireJS code on the page
+    // into the optimized files. Therefore load these libraries through script tags and explicitly define them.
+    // Note that when the optimizer executes this code, window will not be defined.
+    if (window) {
+        var defineDependency = function(globalName, name, noShim) {
+            var getGlobalValue = function(name) {
+                    var globalNamePath = name.split('.'),
+                        result = window,
+                        i;
+                    for (i = 0; i < globalNamePath.length; i++) {
+                        result = result[globalNamePath[i]];
+                    }
+                    return result;
+                },
+                globalValue = getGlobalValue(globalName);
+            if (globalValue) {
+                if (noShim) {
+                    define(name, {});
+                } else {
+                    define(name, [], function() { return globalValue; });
+                }
+            } else {
+                console.error('Expected library to be included on page, but not found on window object: ' + name);
+            }
+        };
+        defineDependency('jQuery', 'jquery');
+        defineDependency('jQuery', 'jquery-migrate');
+        defineDependency('_', 'underscore');
+    }
+    requirejs.config({
+        baseUrl: '/base/',
+        paths: {
+            moment: 'common_static/common/js/vendor/moment-with-locales',
+            draggabilly: 'common_static/js/vendor/draggabilly',
+            'edx-ui-toolkit': 'common_static/edx-ui-toolkit',
+            hls: 'common_static/common/js/vendor/hls'
+        },
+        shim: {
+            moment: {
+                exports: 'moment'
+            },
+            hls: {
+                exports: 'Hls'
+            }
+        }
+    });
+}).call(this, RequireJS.requirejs, RequireJS.define);