Add 'reinstall apps' button

index.html

@@ -128,9 +128,10 @@
 
         <h3>Utilities</h3>
         <p><button class="btn" id="settime">Set Bangle.js Time</button>
-           <button class="btn" id="removeall">Remove all Apps</button>
+           <button class="btn" id="removeall" data-tooltip="Delete everything from your Bangle, leaving it blank">Remove all Apps</button>
+           <button class="btn" id="reinstallall" data-tooltip="Remove and re-install every app, leaving all other data intact">Reinstall apps</button>
            <button class="btn" id="installdefault">Install default apps</button>
-           <button class="btn" id="installfavourite">Install favourite apps</button></p>
+           <button class="btn" id="installfavourite" data-tooltip="Delete everything, install apps you've marked as favourites">Install favourite apps</button></p>
         <p><button class="btn tooltip tooltip-right" id="downloadallapps" data-tooltip="Download all Bangle.js files to a ZIP file">Backup</button>
            <button class="btn tooltip tooltip-right" id="uploadallapps" data-tooltip="Restore Bangle.js from a ZIP file">Restore</button></p>
         <h3>Settings</h3>

loader.js

@@ -155,6 +155,29 @@ window.addEventListener('load', (event) => {
     });
   });
 
+  // Button to install all default apps in one go
+  document.getElementById("reinstallall").addEventListener("click",event=>{
+    var promise =  showPrompt("Reinstall","Really re-install all apps?").then(() => {
+      getInstalledApps().then(installedapps => {
+        console.log(installedapps);
+        var promise = Promise.resolve();
+        installedapps.forEach(app => {
+          if (app.custom)
+            return console.log(`Ignoring ${app.id} as customised`);
+          var oldApp = app;
+          app = appJSON.find(a => a.id==oldApp.id);
+          if (!app)
+            return console.log(`Ignoring ${oldApp.id} as not found`);
+          promise = promise.then(() => updateApp(app));
+        });
+        return promise;
+      }).catch(err=>{
+        Progress.hide({sticky:true});
+        showToast("App re-install failed, "+err,"error");
+      });
+    });
+  });
+
   // Button to install all default apps in one go
   document.getElementById("installdefault").addEventListener("click",event=>{
     getInstalledApps().then(() => {