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.cpp

@@ -9,38 +9,6 @@
 #include "Maths.h"
 #include "VFormat.h"
 
-static const char* GCChar(const SDL_GameControllerButton button)
-{
-    switch (button)
-    {
-    case SDL_CONTROLLER_BUTTON_A:
-        return "A";
-    case SDL_CONTROLLER_BUTTON_B:
-        return "B";
-    case SDL_CONTROLLER_BUTTON_X:
-        return "X";
-    case SDL_CONTROLLER_BUTTON_Y:
-        return "Y";
-    case SDL_CONTROLLER_BUTTON_BACK:
-        return "BACK";
-    case SDL_CONTROLLER_BUTTON_GUIDE:
-        return "GUIDE";
-    case SDL_CONTROLLER_BUTTON_START:
-        return "START";
-    case SDL_CONTROLLER_BUTTON_LEFTSTICK:
-        return "L3";
-    case SDL_CONTROLLER_BUTTON_RIGHTSTICK:
-        return "R3";
-    case SDL_CONTROLLER_BUTTON_LEFTSHOULDER:
-        return "LB";
-    case SDL_CONTROLLER_BUTTON_RIGHTSHOULDER:
-        return "RB";
-    default:
-        SDL_assert(0 && "Unhandled button!");
-        return NULL;
-    }
-}
-
 int ss_toi(const std::string& str)
 {
     int retval = 0;
@@ -157,20 +125,6 @@ int UtilityClass::Int(const char* str, int fallback /*= 0*/)
     return (int) SDL_strtol(str, NULL, 0);
 }
 
-std::string UtilityClass::GCString(const std::vector<SDL_GameControllerButton>& buttons)
-{
-    std::string retval = "";
-    for (size_t i = 0; i < buttons.size(); i += 1)
-    {
-        retval += GCChar(buttons[i]);
-        if ((i + 1) < buttons.size())
-        {
-            retval += ",";
-        }
-    }
-    return retval;
-}
-
 int UtilityClass::hms_to_seconds(int h, int m, int s)
 {
     return h*3600 + m*60 + s;