Day and night changes, optimized sloping appearance, and optimized performance — XiJiang Shipyard Steam update #667229

1. Two interactive objects have been added to the earth map. An object can purchase torches and candles from it. An object can change the day and night of a map. Clicking on the black antenna will change the map from day to night, and clicking on the white antenna will change the map from night to day. 2. Optimized the appearance of the sloping surface, making it more natural. 3. Optimized performance. It is faster to load a super large scene (with over 500000 blocks in the scene). When adding and deleting oversized objects, the game response is not as sluggish. If the deleted object consists of more than 512 blocks, there will be an excessive animation of demolition. If t...