nanopos, lightning-charge and spark-wallet: Package via node2nix

The strategy of invoking node2nix inside a derivation (installPhase in
this case) does not work, as under NixOS installations there is no
network traffic allowed during a derivation build. Hence, we move
node2nix outside and rewrite the packaging into the modules.

Also switch to callPackage instead of plain imports. This could
probably be done on all other imported packages inside of
nix-bitcoin-pkgs.nix.

pkgs/spark-wallet/composition.nix

@@ -0,0 +1,21 @@
+# This file has been generated by node2nix 1.6.1. Do not edit!
+
+{pkgs ? import <nixpkgs> {
+    inherit system;
+  }, system ? builtins.currentSystem, nodejs ? pkgs."nodejs-10_x"}:
+
+let
+  globalBuildInputs = pkgs.lib.attrValues (import ./supplement.nix {
+    inherit nodeEnv;
+    inherit (pkgs) fetchurl fetchgit;
+  });
+  nodeEnv = import ./node-env.nix {
+    inherit (pkgs) stdenv python2 utillinux runCommand writeTextFile;
+    inherit nodejs;
+    libtool = if pkgs.stdenv.isDarwin then pkgs.darwin.cctools else null;
+  };
+in
+import ./node-packages.nix {
+  inherit (pkgs) fetchurl fetchgit;
+  inherit nodeEnv globalBuildInputs;
+}