add walls destroyed stat

tank-frontend/src/Scoreboard.tsx

@@ -42,6 +42,11 @@ export default function Scoreboard({}: {}) {
                 field: 'ratio',
                 visualize: p => p.scores.ratio.toString(),
                 sorter: (a, b) => numberSorter(a.scores.ratio, b.scores.ratio)
+            },
+            {
+                field: 'walls',
+                visualize: p => p.scores.wallsDestroyed.toString(),
+                sorter: (a, b) => numberSorter(a.scores.wallsDestroyed, b.scores.wallsDestroyed)
             }
         ]}/>
 }

tank-frontend/src/serverCalls.tsx

@@ -14,6 +14,7 @@ export type Player = {
     readonly scores: {
         readonly kills: number;
         readonly deaths: number;
+        readonly wallsDestroyed: number;
     };
 };