add magazine system (cannot reload currently)

tanks-backend/TanksServer/Models/Magazine.cs

@@ -0,0 +1,44 @@
+using System.Text;
+
+namespace TanksServer.Models;
+
+[Flags]
+internal enum MagazineType
+{
+    Basic = 1 << 0,
+    Fast = 1 << 1,
+    Explosive = 1 << 2,
+    Smart = 1 << 3,
+    Mine = 1 << 4,
+}
+
+internal readonly record struct Magazine(MagazineType Type, byte UsedBullets, byte MaxBullets)
+{
+    public bool Empty => UsedBullets >= MaxBullets;
+
+    public string ToDisplayString()
+    {
+        var sb = new StringBuilder();
+
+        if (Type.HasFlag(MagazineType.Fast))
+            sb.Append('»');
+        if (Type.HasFlag(MagazineType.Explosive))
+            sb.Append('*');
+        if (Type.HasFlag(MagazineType.Smart))
+            sb.Append('@');
+        if (Type.HasFlag(MagazineType.Mine))
+            sb.Append('\u263c');
+
+        if (sb.Length > 0)
+            sb.Append(' ');
+
+        sb.Append("[ ");
+        for (var i = 0; i < UsedBullets; i++)
+            sb.Append("\u25cb ");
+        for (var i = UsedBullets; i < MaxBullets; i++)
+            sb.Append("• ");
+        sb.Append(']');
+
+        return sb.ToString();
+    }
+}