Angular 6 (#556)

* upgrade to angular 6 (with rxjs-compat)

* fix tests

* fix test scripts

* upgrade rxjs to 6.0

* remove rxjs-compat layer

* update unit tests

* restore tests

* context-menu transparent backdrop

* upgrade libs

* changed snackbar locator

* locator as class

* remove locator element reference

* snackbar locators

* wait for snackbar before executing the action button

* expect cdk-overlay before mat-menu-panel condition

* update libs

src/app/components/toolbar/document-display-mode/document-display-mode.component.ts

@@ -24,7 +24,7 @@
  */
 
 import { Component } from '@angular/core';
-import { Observable } from 'rxjs/Rx';
+import { Observable } from 'rxjs';
 import { Store } from '@ngrx/store';
 import { AppStore } from '../../../store/states';
 import { documentDisplayMode } from '../../../store/selectors/app.selectors';

src/app/components/toolbar/toggle-favorite/toggle-favorite.component.ts

@@ -27,7 +27,7 @@ import { Component } from '@angular/core';
 import { Store } from '@ngrx/store';
 import { AppStore, SelectionState } from '../../../store/states';
 import { appSelection } from '../../../store/selectors/app.selectors';
-import { Observable } from 'rxjs/Observable';
+import { Observable } from 'rxjs';
 
 @Component({
     selector: 'app-toggle-favorite',

src/app/components/toolbar/toggle-info-drawer/toggle-info-drawer.component.ts

@@ -24,7 +24,7 @@
  */
 
 import { Component } from '@angular/core';
-import { Observable } from 'rxjs/Rx';
+import { Observable } from 'rxjs';
 import { Store } from '@ngrx/store';
 import { AppStore } from '../../../store/states';
 import { infoDrawerOpened } from '../../../store/selectors/app.selectors';