Adds spec additionalProperties + nullable examples (#2405)

* Adds v2 spec additionalproperties examples, adds v3 spec nulllable model example, updates samples

* Remaining samples updates

* Adds csharp generator update to handle models with multilevel parent types, which works for the AdditionalPropertiesObject model, samples updated

samples/client/petstore/javascript-es6/src/model/AdditionalPropertiesArray.js

@@ -0,0 +1,75 @@
+/**
+ * OpenAPI Petstore
+ * This spec is mainly for testing Petstore server and contains fake endpoints, models. Please do not use this for any other purpose. Special characters: \" \\
+ *
+ * OpenAPI spec version: 1.0.0
+ * 
+ *
+ * NOTE: This class is auto generated by OpenAPI Generator (https://openapi-generator.tech).
+ * https://openapi-generator.tech
+ * Do not edit the class manually.
+ *
+ */
+
+import ApiClient from '../ApiClient';
+
+/**
+ * The AdditionalPropertiesArray model module.
+ * @module model/AdditionalPropertiesArray
+ * @version 1.0.0
+ */
+class AdditionalPropertiesArray {
+    /**
+     * Constructs a new <code>AdditionalPropertiesArray</code>.
+     * @alias module:model/AdditionalPropertiesArray
+     * @extends Object
+     */
+    constructor() { 
+        
+        AdditionalPropertiesArray.initialize(this);
+    }
+
+    /**
+     * Initializes the fields of this object.
+     * This method is used by the constructors of any subclasses, in order to implement multiple inheritance (mix-ins).
+     * Only for internal use.
+     */
+    static initialize(obj) { 
+    }
+
+    /**
+     * Constructs a <code>AdditionalPropertiesArray</code> from a plain JavaScript object, optionally creating a new instance.
+     * Copies all relevant properties from <code>data</code> to <code>obj</code> if supplied or a new instance if not.
+     * @param {Object} data The plain JavaScript object bearing properties of interest.
+     * @param {module:model/AdditionalPropertiesArray} obj Optional instance to populate.
+     * @return {module:model/AdditionalPropertiesArray} The populated <code>AdditionalPropertiesArray</code> instance.
+     */
+    static constructFromObject(data, obj) {
+        if (data) {
+            obj = obj || new AdditionalPropertiesArray();
+
+            ApiClient.constructFromObject(data, obj, 'Array');
+            
+
+            if (data.hasOwnProperty('name')) {
+                obj['name'] = ApiClient.convertToType(data['name'], 'String');
+            }
+        }
+        return obj;
+    }
+
+
+}
+
+/**
+ * @member {String} name
+ */
+AdditionalPropertiesArray.prototype['name'] = undefined;
+
+
+
+
+
+
+export default AdditionalPropertiesArray;
+