Fix restart button when Done

When the flashing process completes the user is asked if they want to
flash another device. Currently the button seems to do nothing; these
changes return the app back to the start screen to allow the user to
attempt another flashing process.

src/App.svelte

@@ -108,6 +108,16 @@
     yumi.setPosition("center");
   });
 
+  ipcRenderer.on("user:restart", () => {
+    push("/");
+    footerData.set({
+      topText: "Restarting",
+      underText: `UBports Installer is restarting`,
+      waitingDots: true
+    });
+    yumi.setPosition("foot");
+  });
+
   //Error handling
   // Catch all unhandled errors in rendering process
   window.onerror = (err, url, line) => {

src/core/core.js

@@ -74,10 +74,14 @@ class Core {
    * @param {String} [file] config file
    * @returns {Promise}
    */
-  prepare(file) {
+  prepare(file, restart) {
     return Promise.all([
       this.readConfigFile(file),
-      this.plugins.init().catch(e => errors.toUser(e, "initializing plugins"))
+      () => { return restart
+                ? true
+                : this.plugins.init()
+                    .catch(e => errors.toUser(e, "initializing plugins"))
+      }
     ]).then(() => {
       if (this.props.config) {
         this.selectOs();

src/main.js

@@ -28,6 +28,7 @@ const mainEvent = require("./lib/mainEvent.js");
 const reporter = require("./lib/reporter.js");
 const menuManager = require("./lib/menuManager.js");
 const core = require("./core/core.js");
+const window = require("./lib/window.js");
 
 // Enable live reload for Electron
 if (process.env.ROLLUP_WATCH) {
@@ -48,8 +49,9 @@ ipcMain.on("reportResult", async (event, result, error) => {
 // FIXME move after a better way to access mainWindow has been found
 mainEvent.on("restart", () => {
   log.info("UBports Installer restarting...");
-  core.kill();
-  mainWindow.reload();
+  window.send("user:restart")
+  core.reset();
+  core.prepare(cli.file, true)
 });
 
 async function createWindow() {
@@ -85,7 +87,7 @@ async function createWindow() {
   });
 
   // Tasks we need for every start and restart
-  mainWindow.webContents.on("did-finish-load", () => core.prepare(cli.file));
+  mainWindow.webContents.on("did-finish-load", () => core.prepare(cli.file, false));
 
   // Task we need only on the first start
   mainWindow.webContents.once("did-finish-load", () => {