nix: Add optional simulator dependencies

nix/docker-image.nix

@@ -25,6 +25,7 @@ pkgs.dockerTools.buildImage {
         # simulator deps
         pygame wasmer
         wasmer-compiler-cranelift
+        pymad requests
       ]))
 
       # random build tools

nix/pkgs.nix

@@ -32,6 +32,8 @@ in with nixpkgs; rec {
     python3Packages.pygame
     python3Packages.wasmer
     python3Packages.wasmer-compiler-cranelift
+    python3Packages.pymad
+    python3Packages.requests
     emscripten
     ncurses5
     esp-gdb