Refactoring of GPS-location (uses featureSource too now), factoring out state, add ReplaceGeometryAction and conflation example

assets/layers/conflation/conflation.json

@@ -0,0 +1,32 @@
+{
+  "id": "conflation",
+  "description": "This is a special meta_layer which render geometry-changes for inspection",
+  "minzoom": 1,
+  "source": {
+    "osmTags": {
+      "or": ["move=yes","newpoint=yes"]
+    }
+  },
+  "name": "Conflation",
+  "title": "Conflation",
+  "mapRendering": [
+    {
+      "location": "point",
+      "icon": "addSmall:#000",
+      "iconSize": "10,10,center"
+    },
+    {
+      "location": "end",
+      "icon": "circle:#0f0",
+      "iconSize": "10,10,center"
+    },{
+      "location": "start",
+      "icon": "square:#f00",
+      "iconSize": "10,10,center"
+    },
+    {
+      "width": "3",
+      "color": "#00f"
+    }
+  ]
+}