chore(deps): Updated to Theia 1.39.0 (#2144)

- update Theia to `1.39.0`,
 - remove the application packager and fix the security vulnerabilities,
 - bundle the backed application with `webpack`, and
 - enhance the developer docs.

Co-authored-by: Akos Kitta <a.kitta@arduino.cc>
Co-authored-by: per1234 <accounts@perglass.com>

Signed-off-by: Akos Kitta <a.kitta@arduino.cc>

electron-app/arduino-ide-backend-main.js

@@ -0,0 +1,42 @@
+// @ts-check
+'use strict';
+
+// Patch for on Linux when `XDG_CONFIG_HOME` is not available, `node-log-rotate` creates the folder with `undefined` name.
+// See https://github.com/lemon-sour/node-log-rotate/issues/23 and https://github.com/arduino/arduino-ide/issues/394.
+// If the IDE2 is running on Linux, and the `XDG_CONFIG_HOME` variable is not available, set it to avoid the `undefined` folder.
+// From the specs: https://specifications.freedesktop.org/basedir-spec/latest/ar01s03.html
+// "If $XDG_CONFIG_HOME is either not set or empty, a default equal to $HOME/.config should be used."
+function enableFileLogger() {
+  const os = require('os');
+  const util = require('util');
+  if (os.platform() === 'linux' && !process.env['XDG_CONFIG_HOME']) {
+    const { join } = require('path');
+    const home = process.env['HOME'];
+    const xdgConfigHome = home
+      ? join(home, '.config')
+      : join(os.homedir(), '.config');
+    process.env['XDG_CONFIG_HOME'] = xdgConfigHome;
+  }
+  const { setup, log } = require('node-log-rotate');
+
+  setup({
+    appName: 'Arduino IDE',
+    maxSize: 10 * 1024 * 1024,
+  });
+  for (const name of ['log', 'trace', 'debug', 'info', 'warn', 'error']) {
+    const original = console[name];
+    console[name] = function () {
+      // eslint-disable-next-line prefer-rest-params
+      const messages = Object.values(arguments);
+      const message = util.format(...messages);
+      original(message);
+      log(message);
+    };
+  }
+}
+
+if (process.env.IDE2_FILE_LOGGER === 'true') {
+  enableFileLogger();
+}
+
+require('./src-gen/backend/main');