Matomo web component

Move Matomo related initialization to its own web component. Use this web component in App-shell.

App-shell has two new parameters: matomo-url and matomo-site-id. These are required for tracking, but tracking is still optional.

packages/matomo/src/matomo.js

@@ -2,6 +2,7 @@ import {i18n} from './i18n.js';
 import {LitElement} from "lit-element";
 import DBPLitElement from 'dbp-common/dbp-lit-element';
 import {EventBus} from 'dbp-common';
+import buildInfo from 'consts:buildInfo';
 
 
 export class MatomoElement extends DBPLitElement {
@@ -53,7 +54,7 @@ export class MatomoElement extends DBPLitElement {
             console.log('add matomo...');
 
             window._paq = window._paq || [];
-            _paq.push(['setCustomVariable', 1, "GitCommit", "<%= buildInfo.info %>", "visit"]);
+            _paq.push(['setCustomVariable', 1, "GitCommit", buildInfo.info, "visit"]);
             _paq.push(['enableHeartBeatTimer']);
             _paq.push(['disableCookies']);
             _paq.push(['trackPageView']);