sweetalert: move to sweetalert2. (#388)

The styling got adjusted to stay as close as possible to the original sweetalert1 styles.
The only visible change is the button order, it is the same as in the web-vault now (OK - CANCEL instead of CANCEL - OK)

- Removed old postinstall gulp hack
- Added tsconfig type definition for sweetalert2 module typing.

src/app/accounts/settings.component.ts

@@ -5,7 +5,7 @@ import {
 
 import { ToasterService } from 'angular2-toaster';
 import { Angulartics2 } from 'angulartics2';
-import swal from 'sweetalert';
+import Swal from 'sweetalert2/src/sweetalert2.js';
 
 import { DeviceType } from 'jslib/enums/deviceType';
 
@@ -136,19 +136,28 @@ export class SettingsComponent implements OnInit {
             checkboxText.appendChild(restartText);
             label.innerHTML = '<input type="checkbox" id="master-pass-restart" checked>';
             label.appendChild(checkboxText);
-            div.innerHTML = '<input type="text" class="swal-content__input" id="pin-val" autocomplete="off" ' +
+
+            div.innerHTML = 
+                `<div class="swal2-text">${this.i18nService.t('setYourPinCode')}</div>` +
+                '<input type="text" class="swal2-input" id="pin-val" autocomplete="off" ' +
                 'autocapitalize="none" autocorrect="none" spellcheck="false" inputmode="verbatim">';
+
             (div.querySelector('#pin-val') as HTMLInputElement).placeholder = this.i18nService.t('pin');
             div.appendChild(label);
 
-            const submitted = await swal({
+            const submitted = await Swal.fire({
                 text: this.i18nService.t('setYourPinCode'),
-                content: { element: div },
-                buttons: [this.i18nService.t('cancel'), this.i18nService.t('submit')],
+                html: div,
+
+                showCancelButton: true,
+                cancelButtonText: this.i18nService.t('cancel'),
+                showConfirmButton: true,
+                confirmButtonText: this.i18nService.t('submit'),
             });
+
             let pin: string = null;
             let masterPassOnRestart: boolean = null;
-            if (submitted) {
+            if (submitted.value) {
                 pin = (document.getElementById('pin-val') as HTMLInputElement).value;
                 masterPassOnRestart = (document.getElementById('master-pass-restart') as HTMLInputElement).checked;
             }