Add character overlay, where skills and passives (changing this) can be set

src/rendering/__tests__/DungeonRenderer.test.ts

@@ -193,7 +193,7 @@ describe('DungeonRenderer', () => {
       pos: { x: 2, y: 2 },
       speed: 100,
       energy: 0,
-      stats: { hp: 10, maxHp: 10, attack: 2, defense: 0, level: 1, exp: 0, expToNextLevel: 0 }
+      stats: { hp: 10, maxHp: 10, attack: 2, defense: 0, level: 1, exp: 0, expToNextLevel: 0, statPoints: 0, skillPoints: 0, strength: 0, dexterity: 0, intelligence: 0, passiveNodes: [] }
     });
 
     (renderer as any).visible[2 * mockWorld.width + 2] = 1;