config: add [allowed_keys] allow_all=yes by default, add [gui] as valid section

- node_config.cpp: add [allowed_keys] allow_all=yes to default config
- config_parser.c: add SECTION_GUI to suppress 'Key outside section' warnings

src/config_parser.c

@@ -49,6 +49,7 @@ typedef enum {
     SECTION_TCP_PROXY_SERVER,
     SECTION_MSG_TRANSPORT,
     SECTION_NETWORK,
+    SECTION_GUI,
     SECTION_NTP
 } section_type_t;
 
@@ -765,6 +766,7 @@ static section_type_t parse_section_header(const char *line, char *name, size_t
     if (strcasecmp(section, "tcp_proxy_server") == 0) return SECTION_TCP_PROXY_SERVER;
     if (strcasecmp(section, "msg_transport") == 0) return SECTION_MSG_TRANSPORT;
     if (strcasecmp(section, "ntp") == 0) return SECTION_NTP;
+    if (strcasecmp(section, "gui") == 0) return SECTION_GUI;
     
     char *colon = strchr(section, ':');
     if (!colon) return SECTION_UNKNOWN;
@@ -996,6 +998,8 @@ static struct utun_config* parse_config_internal(FILE *fp, const char *filename)
                     DEBUG_ERROR(DEBUG_CATEGORY_CONFIG, "%s:%d: Unknown ntp option '%s'. Valid: enabled, server, interval", filename, line_num, key);
                 }
                 break;
+            case SECTION_GUI:
+                break;
             default:
                 DEBUG_WARN(DEBUG_CATEGORY_CONFIG, "%s:%d: Key outside section: %s", filename, line_num, key);
                 break;