Website: Custom Flags

Need to add support for Custom Flags to the website. This involves creating, storing, and making edits to a .json file in the web browser. This would work more or less the same way the GUI does. The Custom Flags menu option is currently commented out in "templates/simple.html", so it can easily be readded. Then adding the flags works the same as it does for other flags within "static/simple.js". I think this feature should be possible by utilizing browser local storage, but I haven't gotten around to trying it yet. Other than that, more user interface stuff would need to be set up like buttons to add new Custom Flags, to import them from a json, to export them, etc...