Start drafting an update for audacity: 2.4.2 -> 3.0.2

The XGD-config patch is removed since it conflicts with the new version of audacity, as it was not merged upstream.

Audacity now requires their own fork of wxWidgets, according to https://wiki.audacityteam.org/wiki/Building_On_Linux - this is the cause of current trouble since I am new to nix and unsure how to integrate it. I copied the current 3.1.4 nixpkgs version of wxWidgets found at pkgs/development/libraries/wxwidgets/3.1/default.nix and modified it to retrieve the forked version, but that's it so far.

pkgs/applications/audio/audacity/default.nix

@@ -1,9 +1,7 @@
 { stdenv
 , lib
 , fetchFromGitHub
-, fetchpatch
 , cmake
-, wxGTK
 , pkg-config
 , python3
 , gettext
@@ -41,33 +39,20 @@
 }:
 
 # TODO
-# - as of 2.4.2, GTK2 is still the recommended version ref https://www.audacityteam.org/download/source/ check if that changes in future versions
+# - as of 3.0.2, GTK2 is still the recommended version ref https://www.audacityteam.org/download/source/ check if that changes in future versions
 # - detach sbsms
 
 stdenv.mkDerivation rec {
   pname = "audacity";
-  version = "2.4.2";
+  version = "3.0.2";
 
   src = fetchFromGitHub {
     owner = "audacity";
     repo = "audacity";
     rev = "Audacity-${version}";
-    sha256 = "sha256-hpRTo5B0EMyzORopsNPOgv6mohBkwJfWfCLnPvFmdFI=";
+    sha256 = "035qq2ff16cdl2cb9iply2bfjmhfl1dpscg79x6c9l0i9m8k41zj";
   };
 
-  patches = [
-    (fetchpatch {
-      url = "https://github.com/audacity/audacity/commit/a070b5d8a8ba10fb86edba6aeb8fdab0f66ba408.patch";
-      sha256 = "sha256-8UZupGcN+/tytAhyy5T1P0nufvsQPeyLgOUMGt7l8Oc=";
-      name = "audacity_xdg_paths.patch";
-    })
-  ];
-
-  # this file *should* be generated by cmake but as of 2.4.2 isn't yet
-  postPatch = ''
-    touch src/RevisionIdent.h
-  '';
-
   # workaround for a broken cmake. Drop it with a later version to see if it works.
   # https://github.com/NixOS/nixpkgs/issues/94905
   cmakeFlags = lib.optional stdenv.isLinux "-DCMAKE_OSX_ARCHITECTURES=";
@@ -110,8 +95,7 @@ stdenv.mkDerivation rec {
     sratom
     suil
     twolame
-    wxGTK
-    wxGTK.gtk
+    import ./wxWidgets-audacity.nix {}
   ] ++ lib.optionals stdenv.isLinux [
     at-spi2-core
     dbus