Tools: Improve and simplify how to build the apps (#2538)

* Improving CLI build

* Improving CLI build

* Remove requirement to build the tools

* Moved Electron app one level down

* Clean up Electron build

* Moved tools to sub-dir

* Updated root script

* update root

* update root

* update root

* update root

* update root

* update root

* Updated build

* Added doc

* Update CI config

* Should not lint index.js

* Fixing jetify

* Fixed linter errors

* Fixed pod build

* Fixed Windows build

ReactNativeClient/tools/podInstall.js

@@ -0,0 +1,15 @@
+const execa = require('execa');
+
+module.exports = async function() {
+	if (process.platform !== 'darwin') return Promise.resolve();
+
+	try {
+		const promise = execa('pod', ['install'], { cwd: `${__dirname}/../ios` });
+		promise.stdout.pipe(process.stdout);
+		await promise;
+	} catch (error) {
+		console.warn('Could not run pod install', error);
+	}
+
+	return Promise.resolve();
+};