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/src/raw/edit/json.js

@@ -0,0 +1,32 @@
+// Once generated by CoffeeScript 1.9.3, but now lives as pure JS
+/* eslint-disable */
+(function() {
+  var extend = function(child, parent) { for (var key in parent) { if (hasProp.call(parent, key)) child[key] = parent[key]; } function ctor() { this.constructor = child; } ctor.prototype = parent.prototype; child.prototype = new ctor(); child.__super__ = parent.prototype; return child; },
+    hasProp = {}.hasOwnProperty;
+
+  this.JSONEditingDescriptor = (function(superClass) {
+    extend(JSONEditingDescriptor, superClass);
+
+    function JSONEditingDescriptor(element) {
+      this.element = element;
+      this.edit_box = CodeMirror.fromTextArea($(".edit-box", this.element)[0], {
+        mode: {
+          name: "javascript",
+          json: true
+        },
+        lineNumbers: true,
+        lineWrapping: true
+      });
+    }
+
+    JSONEditingDescriptor.prototype.save = function() {
+      return {
+        data: JSON.parse(this.edit_box.getValue())
+      };
+    };
+
+    return JSONEditingDescriptor;
+
+  })(XModule.Descriptor);
+
+}).call(this);

xmodule/js/src/raw/edit/metadata-only.js

@@ -0,0 +1,24 @@
+// Once generated by CoffeeScript 1.9.3, but now lives as pure JS
+/* eslint-disable */
+(function() {
+  var extend = function(child, parent) { for (var key in parent) { if (hasProp.call(parent, key)) child[key] = parent[key]; } function ctor() { this.constructor = child; } ctor.prototype = parent.prototype; child.prototype = new ctor(); child.__super__ = parent.prototype; return child; },
+    hasProp = {}.hasOwnProperty;
+
+  this.MetadataOnlyEditingDescriptor = (function(superClass) {
+    extend(MetadataOnlyEditingDescriptor, superClass);
+
+    function MetadataOnlyEditingDescriptor(element) {
+      this.element = element;
+    }
+
+    MetadataOnlyEditingDescriptor.prototype.save = function() {
+      return {
+        data: null
+      };
+    };
+
+    return MetadataOnlyEditingDescriptor;
+
+  })(XModule.Descriptor);
+
+}).call(this);

xmodule/js/src/raw/edit/xml.js

@@ -0,0 +1,29 @@
+// Once generated by CoffeeScript 1.9.3, but now lives as pure JS
+/* eslint-disable */
+(function() {
+  var extend = function(child, parent) { for (var key in parent) { if (hasProp.call(parent, key)) child[key] = parent[key]; } function ctor() { this.constructor = child; } ctor.prototype = parent.prototype; child.prototype = new ctor(); child.__super__ = parent.prototype; return child; },
+    hasProp = {}.hasOwnProperty;
+
+  this.XMLEditingDescriptor = (function(superClass) {
+    extend(XMLEditingDescriptor, superClass);
+
+    function XMLEditingDescriptor(element) {
+      this.element = element;
+      this.edit_box = CodeMirror.fromTextArea($(".edit-box", this.element)[0], {
+        mode: "xml",
+        lineNumbers: true,
+        lineWrapping: true
+      });
+    }
+
+    XMLEditingDescriptor.prototype.save = function() {
+      return {
+        data: this.edit_box.getValue()
+      };
+    };
+
+    return XMLEditingDescriptor;
+
+  })(XModule.Descriptor);
+
+}).call(this);