Optimized imports (getting close to release)

src/engine/db/handlers/dbMineHandler.java

@@ -14,7 +14,6 @@ import engine.objects.Mine;
 import engine.objects.MineProduction;
 import engine.objects.Resource;
 
-import java.time.LocalDateTime;
 import java.util.ArrayList;
 
 public class dbMineHandler extends dbHandlerBase {