Add XEP-0280 support

src/config/preferences.c

@@ -558,6 +558,7 @@ _get_group(preference_t pref)
             return PREF_GROUP_PRESENCE;
         case PREF_CONNECT_ACCOUNT:
         case PREF_DEFAULT_ACCOUNT:
+        case PREF_CARBONS:
             return PREF_GROUP_CONNECTION;
         case PREF_OTR_WARN:
         case PREF_OTR_LOG:
@@ -593,6 +594,8 @@ _get_key(preference_t pref)
             return "intype";
         case PREF_HISTORY:
             return "history";
+        case PREF_CARBONS:
+            return "carbons";
         case PREF_MOUSE:
             return "mouse";
         case PREF_OCCUPANTS:

src/config/preferences.h

@@ -59,6 +59,7 @@ typedef enum {
     PREF_FLASH,
     PREF_INTYPE,
     PREF_HISTORY,
+    PREF_CARBONS,
     PREF_MOUSE,
     PREF_OCCUPANTS,
     PREF_OCCUPANTS_SIZE,