xdragon: rename -> dragon-drop

mwh/dragon#17 nominates 'dragon-drop' as disambiguation
(https://github.com/mwh/dragon/issues/17#issuecomment-947332142)

xdragon alias for compatibility

'dragon' binary removal
pkg upstream suggests to use the disambiguating name exclusively

top-level/all-packages.nix lowPrio
lowPrio was introduced because kdePackages.dragon also produces a 'dragon'
binary (no longer needed, see above).

doc/release-notes/rl-2505.section.md

···
 - [testers.shellcheck](https://nixos.org/manual/nixpkgs/unstable/#tester-shellcheck) now warns when `name` is not provided.
   The `name` argument will become mandatory in a future release.
 
+- `xdragon` package has been renamed to `dragon-drop`.
+  `xdragon` is an alias to `dragon-drop` and the package still provides `bin/xdragon`.
+  `bin/dragon` is no longer supplied.
+
 - The `nixLog*` family of functions made available through the standard environment have been rewritten to prefix messages with both the debug level and the function name of the caller.
   The `nixLog` function, which logs unconditionally, was also re-introduced and modified to prefix messages with the function name of the caller.
   For more information, [see this PR](https://github.com/NixOS/nixpkgs/pull/370742).

pkgs/by-name/xd/xdragon/package.nix pkgs/by-name/dr/dragon-drop/package.nix

···
 }:
 
 stdenv.mkDerivation (finalAttrs: {
-  pname = "xdragon";
+  pname = "dragon-drop";
   version = "1.2.0";
 
   src = fetchFromGitHub {
···
   nativeBuildInputs = [ pkg-config ];
   buildInputs = [ gtk3 ];
 
+  makeFlags = [ "NAME=dragon-drop" ];
   installFlags = [ "PREFIX=${placeholder "out"}" ];
   postInstall = ''
-    ln -s $out/bin/dragon $out/bin/xdragon
+    ln -s $out/bin/dragon-drop $out/bin/xdragon
   '';
 
   meta = with lib; {
···
       das_j
       taliyahwebb
     ];
-    mainProgram = "xdragon";
+    mainProgram = "dragon-drop";
   };
 })

pkgs/top-level/aliases.nix

···
   xbmc-retroarch-advanced-launchers = throw "'xbmc-retroarch-advanced-launchers' has been renamed to/replaced by 'kodi-retroarch-advanced-launchers'"; # Converted to throw 2024-10-17
   xboxdrv = throw "'xboxdrv' has been dropped as it has been superseded by an in-tree kernel driver"; # Added 2024-12-25
   xdg_utils = throw "'xdg_utils' has been renamed to/replaced by 'xdg-utils'"; # Converted to throw 2024-10-17
+  xdragon = dragon-drop; # Added 2025-03-22
   xen-light = throw "'xen-light' has been renamed to/replaced by 'xen-slim'"; # Added 2024-06-30
   xen-slim = throw "'xen-slim' has been renamed to 'xen'. The old Xen package with built-in components no longer exists"; # Added 2024-10-05
   xen_4_16 = throw "While Xen 4.16 was still security-supported when it was removed from Nixpkgs, it would have reached its End of Life a couple of days after NixOS 24.11 released. To avoid shipping an insecure version of Xen, the Xen Project Hypervisor Maintenance Team decided to delete the derivation entirely"; # Added 2024-10-05

pkgs/top-level/all-packages.nix

···
     stdenv = gccStdenv;
   };
 
-  xdragon = lowPrio (callPackage ../by-name/xd/xdragon/package.nix { });
-
   sail-riscv = callPackage ../applications/virtualization/sail-riscv {
     inherit (ocamlPackages) sail;
   };