Added support for savemaxpower

TOOHUCardAPI/Data/Services/StoreService.cs

@@ -29,6 +29,14 @@ namespace TOOHUCardAPI.Data.Services
             _logger.LogInformation($"User with steamid {user.SteamId} was given {points} points. New total: {user.Point}");
         }
 
+        public async Task<int> ChangePowerMaxTotal(string steamId, int amt)
+        {
+            User user = await _userRepository.GetUser(steamId);
+            user.PowerMaxTotal = Math.Clamp(user.PowerMaxTotal + amt, 0, int.MaxValue);
+            await _userRepository.UpdateUser(user);
+            return user.PowerMaxTotal;
+        }
+
         public async Task<int> LevelUpCard(string steamId, string itemName, int levelIncrease)
         {
             User user = await _userRepository.GetUser(steamId);