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/core/hle/service/cfg/cfg.h

@@ -342,5 +342,26 @@ void SetSoundOutputMode(SoundOutputMode mode);
  */
 SoundOutputMode GetSoundOutputMode();
 
+/**
+ * Generates a new random console unique id.
+ * @param random_number a random generated 16bit number stored at 0x90002, used for generating the
+ * console_id
+ * @param console_id the randomly created console id
+ */
+void GenerateConsoleUniqueId(u32& random_number, u64& console_id);
+
+/**
+ * Sets the random_number and the  console unique id in the config savegame.
+ * @param random_number the random_number to set
+ * @param console_id the console id to set
+ */
+ResultCode SetConsoleUniqueId(u32 random_number, u64 console_id);
+
+/**
+ * Gets the console unique id from config savegame.
+ * @returns the console unique id
+ */
+u64 GetConsoleUniqueId();
+
 } // namespace CFG
 } // namespace Service