feat(classes.ghost): Add members, settings and webhooks support; implement Member class and add tests

ts/00_commitinfo_data.ts

@@ -3,6 +3,6 @@
  */
 export const commitinfo = {
   name: '@apiclient.xyz/ghost',
-  version: '1.3.0',
+  version: '1.4.0',
   description: 'An unofficial Ghost CMS API package enabling content and admin functionality for managing posts.'
 }