Snake (#2549)

* Create the Shopping Cart Lock app

Will demonstrate tomorrow. Don't merge until I do 😁

* Fixes for HTotoo's comments 😎

* Improved audio the best I can.

If nobody has any ideas to further improve high frequencies of the audio, the hardware may not be capable. I still need to check with line-out to better speaker to make sure it's not just the speaker, but it shouldn't be.

* Compared against baseband_api.cpp - matched some things better but still playback seems to be missing higher fq sounds

* renamed wav files to a more specific / less generic name

* indentation + using variables instead of litteral names for wav files to use

* indentation

* Made a Snake game - enjoy

* Code formatting. I always forget.

* move to keep sort order

* Update external.ld

Sorry I should have also asked if there was any reason that address ranges 0xADDA0000--0xADDD0000 were skipped in external.ld.  I assumed there wasn't so I changed it to be consecutive using the same 0x10000 step as the other modules.  If there is any reason to skip them then we should add a comment to note it.  Of course these are all just temporary address values used for linking and get overwritten by a kludgy "search & replace" during the build process.

Resolves enhancement request #764

---------

Co-authored-by: gullradriel <gullradriel@no-mail.com>
Co-authored-by: Mark Thompson <129641948+NotherNgineer@users.noreply.github.com>

firmware/application/external/snake/Arial12x12.h

@@ -0,0 +1,29 @@
+/*
+ * Copyright (C) 2024 Mark Thompson
+ *
+ * This file is part of PortaPack.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2, or (at your option)
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; see the file COPYING.  If not, write to
+ * the Free Software Foundation, Inc., 51 Franklin Street,
+ * Boston, MA 02110-1301, USA.
+ */
+
+// dummy include file to avoid changing original source
+
+#ifndef __UI_Arial12x12_H__
+#define __UI_Arial12x12_H__
+
+#define Arial12x12 (0)
+
+#endif /*__UI_Arial12x12_H__*/