Remove libretro core - core will now be maintained by libretro

libretro have agreed to take over maintenance of the core.

Please see their fork at https://github.com/libretro/duckstation if you
wish to continue to use it.

scripts/gamesettings_to_libretro.py

@@ -1,106 +0,0 @@
-import sys
-import configparser
-
-def parse_ini(path):
-    config = configparser.ConfigParser()
-    config.read(path)
-
-    entries = {}
-    int_keys = {
-        "DisplayActiveStartOffset": "display_active_start_offset",
-        "DisplayActiveEndOffset": "display_active_end_offset",
-        "DMAMaxSliceTicks": "dma_max_slice_ticks",
-        "DMAHaltTicks": "dma_halt_ticks",
-        "GPUFIFOSize" : "gpu_fifo_size",
-        "GPUMaxRunAhead" : "gpu_max_run_ahead"
-    }
-    float_keys = {
-        "GPUPGXPTolerance" : "gpu_pgxp_tolerance"
-    }
-    traits = [
-        "ForceInterpreter",
-        "ForceSoftwareRenderer",
-        "ForceInterlacing",
-        "DisableTrueColor",
-        "DisableUpscaling",
-        "DisableScaledDithering",
-        "DisableForceNTSCTimings",
-        "DisableWidescreen",
-        "DisablePGXP",
-        "DisablePGXPCulling",
-        "DisablePGXPTextureCorrection",
-        "ForcePGXPVertexCache",
-        "ForcePGXPCPUMode",
-        "DisableAnalogModeForcing",
-        "ForceRecompilerMemoryExceptions",
-        "ForceRecompilerICache"
-    ]
-
-    for gameid in config.sections():
-        entry = {}
-        for ini_key, cpp_key in int_keys.items():
-            try:
-                value = config.get(gameid, ini_key)
-                if value is not None:
-                    entry[cpp_key] = str(value)
-            except configparser.NoOptionError:
-                pass
-
-        for ini_key, cpp_key in float_keys.items():
-            try:
-                value = config.getfloat(gameid, ini_key, fallback=None)
-                if value is not None:
-                    entry[cpp_key] = str(value)
-            except configparser.NoOptionError:
-                pass
-        
-        for trait in traits:
-            try:
-                value = config.getboolean(gameid, trait, fallback=None)
-                if value == True:
-                    if "traits" not in entry:
-                        entry["traits"] = []
-                    entry["traits"].append(trait)
-            except configparser.NoOptionError:
-                pass
-
-        if len(entry) > 0:
-            entries[gameid] = entry
-
-    return entries
-
-
-def write_cpp(entries, path):
-    print("Writing %u entries to '%s'" % (len(entries), path))
-    with open(path, "w") as f:
-        f.write('#include "libretro_game_settings.h"\n')
-        f.write('\n')
-        f.write('std::unique_ptr<GameSettings::Entry> GetSettingsForGame(const std::string& game_code)\n')
-        f.write('{\n')
-        f.write('  std::unique_ptr<GameSettings::Entry> gs = std::make_unique<GameSettings::Entry>();\n')
-        f.write('\n')
-
-        for gameid, entry in entries.items():
-            f.write('  if (game_code == "%s")\n' % gameid)
-            f.write('  {\n')
-            for key, value in entry.items():
-                if key == "traits":
-                    for trait in value:
-                        f.write('    gs->AddTrait(GameSettings::Trait::%s);\n' % trait)
-                else:
-                    f.write('    gs->%s = %s;\n' % (key, value))
-            f.write('    return gs;\n')
-            f.write('  }\n')
-            f.write('\n')
-
-        f.write('  return {};\n')
-        f.write('}\n')
-    
-
-if __name__ == "__main__":
-    if len(sys.argv) < 3:
-        print("usage: %s <path to gamesettings.ini> <output cpp file>" % sys.argv[0])
-        sys.exit(1)
-
-    entries = parse_ini(sys.argv[1])
-    write_cpp(entries, sys.argv[2])