Use custom ClientRect interface

Closes #251

shared/src/components/popover/popover.component.ts

@@ -6,6 +6,8 @@ import {
 import { Store } from '@ngrx/store';
 import { Observable } from 'rxjs/Observable';
 
+import { ClientRect } from '../../dom';
+
 import {
     KeyAction,
     KeystrokeAction,

shared/src/components/svg/wrap/svg-keyboard-wrap.component.ts

@@ -17,6 +17,8 @@ import 'rxjs/add/observable/of';
 import 'rxjs/add/operator/map';
 import { Store } from '@ngrx/store';
 
+import { ClientRect } from '../../../dom';
+
 import { MapperService } from '../../../services/mapper.service';
 
 import {