Add submodule_update.sh

Signed-off-by: Severin Kaderli <severin.kaderli@gmail.com>

system/bin/utils.sh

@@ -43,12 +43,23 @@ function print_header() {
 
 # Function to print a info message with the current time and to send
 # a notification using notify-send.
-# USAGE: print_info TITLE MESSAGE
+# USAGE: print_log TITLE MESSAGE
 function print_log() {
     notify-send "${1}" "${2}"
     echo -e "${YELLOW}[$(date "+%H:%M:%S")] ${1} ${2}${RESET}"
 }
 
+# Prints a section title.
+# USAGE: print_section TITLE
+function print_section() {
+    echo -e "${YELLOW}${1}"
+    echo -e "----------------------------------------${RESET}"
+}
+
+function print_log() {
+    echo -e "- $1"
+}
+
 # Creates the given directory in the home directory
 # USAGE: create_directory DIRECTORY
 function create_directory() {