feat: Autoping availability warning

src/config/preferences.c

@@ -1816,6 +1816,7 @@ _get_group(preference_t pref)
     case PREF_TRAY:
     case PREF_TRAY_READ:
     case PREF_ADV_NOTIFY_DISCO_OR_VERSION:
+    case PREF_AUTOPING_WARNING:
         return PREF_GROUP_NOTIFICATIONS;
     case PREF_DBLOG:
     case PREF_CHLOG:
@@ -2156,6 +2157,8 @@ _get_key(preference_t pref)
         return "force-encryption.enabled";
     case PREF_FORCE_ENCRYPTION_MODE:
         return "force-encryption.policy";
+    case PREF_AUTOPING_WARNING:
+        return "autoping.warning";
     default:
         return NULL;
     }
@@ -2208,6 +2211,7 @@ _get_default_boolean(preference_t pref)
     case PREF_MOOD:
     case PREF_STROPHE_SM_ENABLED:
     case PREF_STROPHE_SM_RESEND:
+    case PREF_AUTOPING_WARNING:
         return TRUE;
     case PREF_PGP_PUBKEY_AUTOIMPORT:
     case PREF_FORCE_ENCRYPTION:

src/config/preferences.h

@@ -188,7 +188,8 @@ typedef enum {
     PREF_VCARD_PHOTO_CMD,
     PREF_STATUSBAR_TABMODE,
     PREF_FORCE_ENCRYPTION,
-    PREF_FORCE_ENCRYPTION_MODE
+    PREF_FORCE_ENCRYPTION_MODE,
+    PREF_AUTOPING_WARNING
 } preference_t;
 
 typedef struct prof_alias_t