Settings can now be taken from separate file with local override.

* Various settings in settings-nvr.js module
* settings-nvr-local.js can override settings-nvr.js
* settings-nvr-local is unchecked file
* Both files can be straight maps, or functions returning maps
* webpack env and args available to those functions

webpack/prod.config.js

@@ -1,15 +1,40 @@
-const path = require('path');
+// vim: set et ts=2 sw=2:
+//
+
 const webpack = require('webpack');
-const merge = require('webpack-merge');
+const NVRSettings = require('./NVRSettings');
 const baseConfig = require('./base.config.js');
 
 const CleanWebpackPlugin = require('clean-webpack-plugin');
 
-module.exports = merge(baseConfig, {
-  plugins: [
-    new webpack.DefinePlugin({
-      'process.env.NODE_ENV': JSON.stringify('production'),
-    }),
-    new CleanWebpackPlugin(['ui-dist'], { root: path.resolve(__dirname, '../') }),
-  ],
-});
+module.exports = (env, args) => {
+  const settingsObject = new NVRSettings(env, args);
+  const nvrSettings = settingsObject.settings;
+
+  return settingsObject.webpackMerge(baseConfig, {
+    optimization: {
+      splitChunks: {
+        cacheGroups: {
+          default: {
+            minChunks: 2,
+            priority: -20,
+          },
+          commons: {
+            test: /[\\/]node_modules[\\/]/,
+            name: 'vendor',
+            chunks: 'all',
+            priority: -10,
+          },
+        },
+      },
+    },
+    plugins: [
+      new webpack.DefinePlugin({
+        'process.env.NODE_ENV': JSON.stringify('production'),
+      }),
+      new CleanWebpackPlugin([nvrSettings.dist_dir], {
+        root: nvrSettings._paths.project_root,
+      }),
+    ],
+  });
+};