Elon Musk is planning to launch a new payments platform, called XMoney, in beta form to select users in April. In  announcing  a planned partnership between XMoney and Visa more than a year ago, then X CEO Linda Yaccarino referred to the platform as a so-called "Everything App" — a reference to the kind of all-in-one digital products that combine messaging, social networking, shopping, payments and other services in a single app, such as China's WeChat. In a brief post  on social media Tuesday,