Major progress on revamp

* 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

core/bbs.js

@@ -212,15 +212,9 @@ function initialize(cb) {
             function initStatLog(callback) {
                 return require('./stat_log.js').init(callback);
             },
-            function initConfigs(callback) {
-                return require('./config_util.js').init(callback);
-            },
-            function initThemes(callback) {
-                //  Have to pull in here so it's after Config init
-                require('./theme.js').initAvailableThemes( (err, themeCount) => {
-                    logger.log.info({ themeCount }, 'Themes initialized');
-                    return callback(err);
-                });
+            function initMenusAndThemes(callback) {
+                const { ThemeManager } = require('./theme');
+                return ThemeManager.create(callback);
             },
             function loadSysOpInformation(callback) {
                 //