feat: update to Angular 8, Nebular 4 (#2114)

src/app/app.module.ts

@@ -3,17 +3,23 @@
  * Copyright Akveo. All Rights Reserved.
  * Licensed under the MIT License. See License.txt in the project root for license information.
  */
-import { APP_BASE_HREF } from '@angular/common';
 import { BrowserModule } from '@angular/platform-browser';
 import { BrowserAnimationsModule } from '@angular/platform-browser/animations';
 import { NgModule } from '@angular/core';
 import { HttpClientModule } from '@angular/common/http';
 import { CoreModule } from './@core/core.module';
-
+import { ThemeModule } from './@theme/theme.module';
 import { AppComponent } from './app.component';
 import { AppRoutingModule } from './app-routing.module';
-import { ThemeModule } from './@theme/theme.module';
-import { NgbModule } from '@ng-bootstrap/ng-bootstrap';
+import {
+  NbChatModule,
+  NbDatepickerModule,
+  NbDialogModule,
+  NbMenuModule,
+  NbSidebarModule,
+  NbToastrModule,
+  NbWindowModule,
+} from '@nebular/theme';
 
 @NgModule({
   declarations: [AppComponent],
@@ -23,14 +29,20 @@ import { NgbModule } from '@ng-bootstrap/ng-bootstrap';
     HttpClientModule,
     AppRoutingModule,
 
-    NgbModule.forRoot(),
     ThemeModule.forRoot(),
+
+    NbSidebarModule.forRoot(),
+    NbMenuModule.forRoot(),
+    NbDatepickerModule.forRoot(),
+    NbDialogModule.forRoot(),
+    NbWindowModule.forRoot(),
+    NbToastrModule.forRoot(),
+    NbChatModule.forRoot({
+      messageGoogleMapKey: 'AIzaSyA_wNuCzia92MAmdLRzmqitRGvCF7wCZPY',
+    }),
     CoreModule.forRoot(),
   ],
   bootstrap: [AppComponent],
-  providers: [
-    { provide: APP_BASE_HREF, useValue: '/' },
-  ],
 })
 export class AppModule {
 }