Re-write app build, created macOS installer package

ext/build.js

@@ -1,11 +1,19 @@
-const { spawn } = require('child_process');
-const argv = require('minimist')(process.argv.slice(2));
+const fs = require("fs-extra");
+const path = require("path");
+const { spawn } = require("child_process");
+const argv = require("minimist")(process.argv.slice(2));
 
 
 const extensionName = "fx_cast";
 const extensionId = "fx_cast@matt.tf";
 const extensionVersion = "0.0.1";
 
+
+if (argv.package) {
+    argv.mode = "production";
+    argv.watch = false;
+}
+
 // Default argument values
 const { mirroringAppId = "19A6F4AE"
       , mode = "development" } = argv;
@@ -18,12 +26,16 @@ const child = spawn(
           + `--mode=${mode} `
           + `${argv.watch ? "--watch" : ""} `
         + `&& web-ext build --overwrite-dest `
-                         + `--source-dir ../dist/ext `
+                         + `--source-dir ../dist/ext/unpacked `
                          + `--artifacts-dir ../dist/ext `
-  , {
-        shell: true
-    }
+  , { shell: true }
 );
 
 child.stdout.pipe(process.stdout);
 child.stderr.pipe(process.stderr);
+
+child.on("exit", () => {
+    if (argv.package) {
+        fs.remove(path.join(__dirname, "../dist/ext/unpacked"));   
+    }
+});