Generate weapon data dynamically from counters

src/modules/game/soldier.js

@@ -43,7 +43,7 @@ function updatePlacement(cell, selected, clone) {
   selected.dataset.previous = prevCoords;
   cell.appendChild(selected);
 
-  selected.childNodes.forEach(n => {
+  Array.from(selected.children).forEach(n => {
     if (n.classList.contains('removed')) {
       n.remove();
     } else if ('preexisting' in n.dataset) {