added license to config file, applied clang-formatting rules to overlooked files

conf/gnss-sdr_GPS_L1_fifo.conf

@@ -1,3 +1,12 @@
+; This is a GNSS-SDR configuration file
+; The configuration API is described at https://gnss-sdr.org/docs/sp-blocks/
+; SPDX-License-Identifier: GPL-3.0-or-later
+; SPDX-FileCopyrightText: (C) 2010-2021  (see AUTHORS file for a list of contributors)
+
+; You can define your own receiver and invoke it by doing
+; gnss-sdr --config_file=my_GNSS_SDR_configuration.conf
+;
+
 [GNSS-SDR]
 
 ;######### GLOBAL OPTIONS ##################

src/core/receiver/gnss_block_factory.cc

@@ -37,8 +37,8 @@
 #include "channel.h"
 #include "configuration_interface.h"
 #include "direct_resampler_conditioner.h"
-#include "file_signal_source.h"
 #include "fifo_signal_source.h"
+#include "file_signal_source.h"
 #include "fir_filter.h"
 #include "freq_xlating_fir_filter.h"
 #include "galileo_e1_dll_pll_veml_tracking.h"