add screen for tutorial for tile where buildings have been destroyed

Author: Hagellach37

mapswipe_workers/sample_data/change_detection_tutorial_bing.json

@@ -2,7 +2,7 @@
   "name": "Change Detection Tutorial",
   "projectType": 3,
   "projectId": "change_detection_tutorial",
-  "zoomLevel": 16,
+  "zoomLevel": 18,
   "lookFor": "CHANGES IN BUILDINGS",
   "status": "change_detection_tutorial",
   "projectDetails": "This is a tutorial",
@@ -27,7 +27,7 @@
   "examplesFile": "sample_data/change_detection_tutorial_tasks_bing.geojson",
   "categories": {
     "changes_1": {
-      "pre": "For this project we are looking for new settlements. Compare the upper (before) and lower (after) image and *SWIPE RIGHT* (not tap) to indicate that new settlements have been built.",
+      "pre": "For this project we are looking for changes regarding settlements. Compare the upper (before) and lower (after) image and *SWIPE RIGHT* (not tap) to indicate that new settlements have been built.",
       "post_correct": "Yes, that looks like a new settlement being developed. Plenty of new houses and huts have been built in this area. Swipe left to continue the tutorial.",
       "post_wrong": "Oh no. Make sure to spot all the new settlements and swipe right. New roads can also function as an indicator sometimes."
     },
@@ -36,8 +36,13 @@
       "post_correct": "Correct. We can spot new settlements in the upper right part of the satellite image. Swipe left to go on with some more examples.",
       "post_wrong": "Take a closer look. There are new settlements here in the upper right part of the satellite image."
     },
+    "changes_3": {
+      "pre": "Sometimes settlement might also disappear because they have been pulled down or destroyed. Also for this case *SWIPE RIGHT* to indicate that the situation changed.",
+      "post_correct": "Correct. We some settlements have been demolished here.",
+      "post_wrong": "Take a closer look. There are settlements in the upper image that are not there in lower one."
+    },
     "no_changes_1": {
-      "pre": "In this example, there are many buildings but *NO NEW SETTLEMENTS* emerged. *SWIPE* left to indicate no changes.",
+      "pre": "In this example, there are many buildings but *NO CHANGES* in settlements can be observed. *SWIPE* left to indicate no changes.",
       "post_correct": "Nice. Just watch out for changes referring to settlements. Swipe left to continue.",
       "post_wrong": "Oh no. Not all changes refer to new settlements, some are just related to agriculture or vegetation."
     },

mapswipe_workers/sample_data/change_detection_tutorial_tasks_bing.geojson

@@ -1,10 +1,11 @@
 {
 "type": "FeatureCollection",
-"name": "change_detection_tutorial_tasks_18",
+"name": "change_detection_tutorial_tasks_bing",
 "crs": { "type": "name", "properties": { "name": "urn:ogc:def:crs:OGC:1.3:CRS84" } },
 "features": [
 { "type": "Feature", "properties": { "TileZ": 18, "reference": 1, "id": 1, "category": "changes_1", "TileX": 146136, "TileY": 126866 }, "geometry": { "type": "MultiPolygon", "coordinates": [ [ [ [ 20.687255859375, 5.76630318845997 ], [ 20.6886291503906, 5.76630318845997 ], [ 20.6886291503906, 5.76493684469301 ], [ 20.687255859375, 5.76493684469301 ], [ 20.687255859375, 5.76630318845997 ] ] ] ] } },
 { "type": "Feature", "properties": { "TileZ": 18, "reference": 1, "id": 1, "category": "changes_2", "TileX": 146138, "TileY": 126875 }, "geometry": { "type": "MultiPolygon", "coordinates": [ [ [ [ 20.6900024414062, 5.75400597619731 ], [ 20.6913757324219, 5.75400597619731 ], [ 20.6913757324219, 5.75263960285187 ], [ 20.6900024414062, 5.75263960285187 ], [ 20.6900024414062, 5.75400597619731 ] ] ] ] } },
+{ "type": "Feature", "properties": { "TileZ": 18, "reference": 1, "id": 1, "category": "changes_3", "TileX": 146121, "TileY": 126870 }, "geometry": { "type": "MultiPolygon", "coordinates": [ [ [ [ 20.6666564941406, 5.76083779365774 ], [ 20.6680297851562, 5.76083779365774 ], [ 20.6680297851562, 5.75947143673713 ], [ 20.6666564941406, 5.75947143673713 ], [ 20.6666564941406, 5.76083779365774 ] ] ] ] } },
 { "type": "Feature", "properties": { "TileZ": 18, "reference": 0, "id": 1, "category": "no_changes_1", "TileX": 146116, "TileY": 126871 }, "geometry": { "type": "MultiPolygon", "coordinates": [ [ [ [ 20.6597900390625, 5.75947143673713 ], [ 20.6611633300781, 5.75947143673713 ], [ 20.6611633300781, 5.75810507652999 ], [ 20.6597900390625, 5.75810507652999 ], [ 20.6597900390625, 5.75947143673713 ] ] ] ] } },
 { "type": "Feature", "properties": { "TileZ": 18, "reference": 0, "id": 1, "category": "no_changes_2", "TileX": 146121, "TileY": 126886 }, "geometry": { "type": "MultiPolygon", "coordinates": [ [ [ [ 20.6666564941406, 5.73897568897884 ], [ 20.6680297851562, 5.73897568897884 ], [ 20.6680297851562, 5.7376092795666 ], [ 20.6666564941406, 5.7376092795666 ], [ 20.6666564941406, 5.73897568897884 ] ] ] ] } },
 { "type": "Feature", "properties": { "TileZ": 18, "reference": 2, "id": 1, "category": "maybe_1", "TileX": 146127, "TileY": 126886 }, "geometry": { "type": "MultiPolygon", "coordinates": [ [ [ [ 20.6748962402344, 5.73897568897884 ], [ 20.67626953125, 5.73897568897884 ], [ 20.67626953125, 5.7376092795666 ], [ 20.6748962402344, 5.7376092795666 ], [ 20.6748962402344, 5.73897568897884 ] ] ] ] } },