Add MCI codes, helpers, and format keys for user availability and visibility

* New MCI codes: IA and IV
* availInicator and visIndicator to WFC format keys
* New helpers for availalbe and visible indicators (see themes)

core/theme.js

@@ -348,7 +348,15 @@ exports.ThemeManager = class ThemeManager {
             getDateTimeFormat : function(style = 'short') {
                 const format = Config().theme.dateTimeFormat[style] || 'MM/DD/YYYY h:mm a';
                 return _.get(theme, `customization.defaults.dateTimeFormat.${style}`, format);
-            }
+            },
+            getStatusAvailIndicators : function() {
+                const format = Config().theme.statusAvailableIndicators || [ 'Y', 'N' ];
+                return _.get(theme, 'customization.defaults.statusAvailableIndicators', format);
+            },
+            getStatusVisibleIndicators : function() {
+                const format = Config().theme.statusVisibleIndicators || [ 'Y', 'N' ];
+                return _.get(theme, 'customization.defaults.statusVisibleIndicators', format);
+            },
         };
     }