Create a random console_unique_id (#2668)

* Create a random console_id when config save_file is created

Added button in system config to refresh the console unique id

* Moved the connect for the button from .ui file to constructor of ConfigureSystem

* Added warning and info dialog
Fixup: Make use of qt5 style connects,
  renamed the refresh button,
  removed some duplicate code,
  changed random device and moved all to the generate function

* Changed the random generator to reflect what a real 3DS stores as console unique id
Fixup: Changed the warning message

* Fixup: Set and Create

* Fixup: Added console id label, therfore removed second message box

* Fixup: fixed the endianess

* Fixup: more endianness fixes

* Fixup: Endianness the 3rd

src/citra_qt/configuration/configure_system.h

@@ -23,6 +23,7 @@ public:
 
 public slots:
     void updateBirthdayComboBox(int birthmonth_index);
+    void refreshConsoleID();
 
 private:
     void ReadSystemSettings();