Add controller button layout mappings

This adds mappings from SDL's Xbox-based SDL_GameControllerButton
constants, to glyphs for the following layouts:

- LAYOUT_NINTENDO_SWITCH_PRO,
- LAYOUT_NINTENDO_SWITCH_JOYCON_L,
- LAYOUT_NINTENDO_SWITCH_JOYCON_R,
- LAYOUT_DECK,
- LAYOUT_PLAYSTATION,
- LAYOUT_XBOX,
- LAYOUT_GENERIC,

There may still be errors in these, but they should be mostly correct.
I'm leaving it up to Ethan to make it show the correct button glyphs
for the correct controllers being connected (and possibly to fix these
mappings where needed).

desktop_version/src/UtilityClass.h

@@ -3,7 +3,6 @@
 
 #include <SDL.h>
 #include <string>
-#include <vector>
 
 int ss_toi(const std::string& str);
 
@@ -102,8 +101,6 @@ public:
 
     static int Int(const char* str, int fallback = 0);
 
-    static std::string GCString(const std::vector<SDL_GameControllerButton>& buttons);
-
     int hms_to_seconds(int h, int m, int s);
 
     void format_time(char* buffer, const size_t buffer_size, int seconds, int frames, bool always_minutes);