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/external.ld

@@ -38,7 +38,6 @@ MEMORY
     ram_external_app_keyfob(rwx) : org = 0xADBD0000, len = 32k
     ram_external_app_tetris(rwx) : org = 0xADBE0000, len = 32k
     ram_external_app_extsensors(rwx) : org = 0xADBF0000, len = 32k
-    ram_external_app_breakout(rwx) : org = 0xADE00000, len = 32k
     ram_external_app_foxhunt_rx(rwx) : org = 0xADC00000, len = 32k
     ram_external_app_audio_test(rwx) : org = 0xADC10000, len = 32k
     ram_external_app_wardrivemap(rwx) : org = 0xADC20000, len = 32k
@@ -65,6 +64,8 @@ MEMORY
     ram_external_app_view_wav(rwx) : org = 0xADD70000, len = 32k 
     ram_external_app_sd_wipe(rwx) : org = 0xADD80000, len = 32k 
     ram_external_app_playlist_editor(rwx) : org = 0xADD90000, len = 32k 
+    ram_external_app_breakout(rwx) : org = 0xADDA0000, len = 32k
+    ram_external_app_snake(rwx) : org = 0xADDB0000, len = 32k    
 }
 
 SECTIONS
@@ -159,6 +160,12 @@ SECTIONS
         *(*ui*external_app*breakout*);
     } > ram_external_app_breakout    
 
+    .external_app_snake : ALIGN(4) SUBALIGN(4)
+    {
+        KEEP(*(.external_app.app_snake.application_information));
+        *(*ui*external_app*snake*);
+    } > ram_external_app_snake    
+
    .external_app_extsensors : ALIGN(4) SUBALIGN(4)
     {
         KEEP(*(.external_app.app_extsensors.application_information));