Move tree copse terrain feature from grid into buildings group

src/radial.js

@@ -511,6 +511,9 @@ function drawMapsheet(gameboard, mapsheet, position) {
   drawHexes(gridContainer, grid, true);
 
   (mapsheet.features || []).forEach(feature => {
+    const featureContainer = document.createElementNS(xmlns, 'g');
+    featureContainer.classList.add('terrain');
+
     const origin = feature.position({ q: 0, r: 0, s: 0 });
     const use = document.createElementNS(xmlns, 'use');
 
@@ -524,7 +527,8 @@ function drawMapsheet(gameboard, mapsheet, position) {
     use.setAttributeNS(null, 'x', x);
     use.setAttributeNS(null, 'y', y);
 
-    gridContainer.appendChild(use);
+    featureContainer.appendChild(use)
+    buildingContainer.appendChild(featureContainer);
   });
 
   container.appendChild(gridContainer);