Add sidebar tab with route analysis data

- adds a new analysis tab in the sidebar
- the analysis tab shows length distribution for different way types, surface, and smoothness
- table rows can be hovered/clicked to highlight the according segments on the map (similar behaviour as the detailed data table)
- localization is implemented for `de` and `en`
- the method for finding segment edges was extracted from `js/control/TrackMessages.js` into `js/util/TrackEdges.js` as it's used in the new analysis class too (the Gulp config was changed to reflect that)

Notes:

I had the idea to use the *DataTable* plugin for rendering the tables but decided against it. The only meaningful way to sort such a table is by the length column and that's already the case. So it's just three plain, old HTML tables, rendered by jQuery.

For meaningful statistics the `processUnusedTags` setting has to be enabled in the routing profile. Only in this case the BRouter backend includes all needed tags (`highway`, `surface`, and `smoothness`) for *every* route segment in the response. I’ve enabled that setting for all profiles at my BRouter-web instance at <https://brouter.m11n.de/>.

js/index.js

@@ -29,6 +29,7 @@
             exportRoute,
             profile,
             trackMessages,
+            trackAnalysis,
             sidebar,
             drawButton,
             deleteRouteButton,
@@ -198,6 +199,9 @@
         trackMessages = new BR.TrackMessages(map, {
             requestUpdate: requestUpdate
         });
+        trackAnalysis = new BR.TrackAnalysis(map, {
+            requestUpdate: requestUpdate
+        });
 
         routingPathQuality = new BR.RoutingPathQuality(map, layersControl);
 
@@ -248,6 +252,7 @@
                 stats.update(track, segments);
             }
             trackMessages.update(track, segments);
+            trackAnalysis.update(track, segments);
 
             exportRoute.update(latLngs);
         }
@@ -260,7 +265,8 @@
             defaultTabId: BR.conf.transit ? 'tab_itinerary' : 'tab_profile',
             listeningTabs: {
                 tab_profile: profile,
-                tab_data: trackMessages
+                tab_data: trackMessages,
+                tab_analysis: trackAnalysis
             }
         }).addTo(map);
         if (BR.conf.transit) {