carla: remove gtk2

- Greetd and its original greeters (`tuigreet`, `gtkgreet`, `qtgreet`, `regreet`, `wlgreet`) were moved from `greetd` namespace to top level (`greetd.tuigreet` -> `tuigreet`, `greetd.greetd` -> `greetd`, etc). The original attrs are available for compatibility as passthrus of `greetd`, but will emit a warning. They will be removed in future releases.

- `carla` no longer support `gtk2` override.

- The `archipelago-minecraft` package was removed, as upstream no longer provides support for the Minecraft APWorld.

- `pcp` has been removed because the upstream repo was archived and it hasn't been updated since 2021.

  lib,

  stdenv,

  fetchFromGitHub,

  fetchpatch2,

  alsa-lib,

  file,

  fluidsynth,

  pkg-config,

  python3Packages,

  which,

  gtk2 ? null,

  gtk3 ? null,

  qtbase ? null,

  withFrontend ? true,

  withGtk2 ? true,

  withGtk3 ? true,

  withQt ? true,

  wrapQtAppsHook ? null,

    libsndfile

  ]

  ++ lib.optional withQt qtbase

  ++ lib.optional withGtk2 gtk2

  ++ lib.optional withGtk3 gtk3;

  propagatedBuildInputs = finalAttrs.pythonPath;

        filename="$(basename -- "$file")"

        substituteInPlace "$file" --replace-fail '--with-appname="$0"' "--with-appname=\"$filename\""

    done

  ''

  + lib.optionalString withGtk2 ''

    # Will try to dlopen() libgtk-x11-2.0 at runtime when using the bridge.

    substituteInPlace source/bridges-ui/Makefile \

        --replace-fail '$(CXX) $(OBJS_GTK2)' '$(CXX) $(OBJS_GTK2) -lgtk-x11-2.0'

  '';

  dontWrapQtApps = true;