Add 'Open' action to file grid context menu

Signed-off-by: trivernis <trivernis@protonmail.com>

mediarepo-ui/src/app/components/shared/file/file-context-menu/file-context-menu.component.html

@@ -1,4 +1,5 @@
 <app-context-menu #contextMenu>
+    <ng-content select="[content-before]"></ng-content>
     <button (click)="this.copyFileHash()" mat-menu-item>Copy Hash</button>
     <button (click)="this.exportFile()" mat-menu-item>Save As...</button>
     <ng-content></ng-content>

mediarepo-ui/src/app/components/shared/file/file-multiview/file-grid/file-grid.component.html

@@ -15,5 +15,6 @@
 
 </div>
 <app-file-context-menu #fileContextMenu>
+    <button (click)="this.fileOpenEvent.emit(fileContextMenu.file)" mat-menu-item content-before>Open</button>
     <button (click)="this.regenerateThumbnail(fileContextMenu.file)" mat-menu-item>Regenerate thumbnail</button>
 </app-file-context-menu>