Use cdk-virtual-scroll for long cipher lists (#1001)

* Use cdk-virtual-scroll for cipher lists

* add trackBy, reorder dom

* Undo merge conflict error

* Fix layout, increase scrolling buffer

* fix linting

* Remove unused infinite-scroll directives for Send

* Add back refresh method

* Update jslib

* Fix itemSize and min/maxBufferPx directives

* Move refresh() into base class

* Use cipherListVirtualScroll strategy

* fix linting

* Update to use latest virtual-scroll strategy

* Update jslib

src/app/send/send.component.html

@@ -39,8 +39,7 @@
             </div>
         </div>
         <div class="content">
-            <div class="list" *ngIf="filteredSends.length" infiniteScroll [infiniteScrollDistance]="1"
-                [infiniteScrollContainer]="'#items .content'" [fromRoot]="true" (scrolled)="loadMore()">
+            <div class="list" *ngIf="filteredSends.length">
                 <a *ngFor="let s of filteredSends" appStopClick (click)="selectSend(s.id)"
                     title="{{'viewItem' | i18n}}" (contextmenu)="viewSendMenu(s)"
                     [ngClass]="{'active': s.id === sendId}" class="flex-list-item">