Toggle Loading of Images on Client

[graywolf336]

When you're using Rocket.Chat on a mobile device and someone decides to have fun with a bot and generates a ton of images it will eat up your mobile data (if you're on cellular data). Having the option to toggle whether it automatically loads the images and things would be fantastic to conserve data. Maybe when they have it toggled off show a link/button to load it, that way if they want to load it manually when they have it turned off they can.