* Deprecated explicit prompt.hjson/general.promptFile, etc.: menu.hjson can simply include any number of files
* All menus and themes, their events, etc. are managed by ThemeManager allowing includes, refs, etc. and much cleaner code
* Themes use ES6 Map vs object{}
* Re-write and re-enable config cache using sane
* Events sent for config, prompt, or menu changes
* Event sent for theme changes
* Theme (or parent menu/prompt) changes cause re-merge and updates to connected clients