Добавлена продвинутая сущность и интерфейс

SelfPropelledArtilleryUnit/EntityAdvancedArtillery.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Artilleries
+{
+    internal class EntityAdvancedArtillery : EntityArtillery
+    {
+        public Color DopColor { get; private set; }
+        public bool Weapon { get; private set; }
+        public bool SalvoBattery { get; private set; }
+        public EntityAdvancedArtillery(int speed, float weight, Color bodyColor, Color dopColor, bool weapon, bool salvoBattery) : base(speed, weight, bodyColor)
+        {
+            DopColor = dopColor;
+            Weapon = weapon;
+            SalvoBattery = salvoBattery;
+        }
+    }
+}

SelfPropelledArtilleryUnit/IDrawningObject.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Artilleries
+{
+    internal interface IDrawningObject
+    {
+        public float Step { get; }
+        void SetObject(int x, int y, int width, int height);
+        void MoveObject(Direction direction);
+        void DrawingObject(Graphics g);
+        (float Left, float Right, float Top, float Bottom) GetCurrentPosition();
+    }
+}