Hotfix DrainSim EA 0.3.1.07

• Fixed voxel savegames on Convenience Store and Parking Garage
• Fixed missing mud on Convenience Store

I know the new level is a hard one, it would be better for the games development if you keep that feedback to the discussion hub or the discord instead of reviewing the game negatively instantly out of frustration. I will see how people adjust to the new digging mechanic over the next few days and balance the new level from there.