Implement basic structure for combat system and refactor code

Assets/Scripts/Combat/NativeTrack.cs

@@ -0,0 +1,20 @@
+using System;
+
+namespace KernelPanic.Combat
+{
+    /// <summary>
+    /// Resolves cards immediately when they are added to the native track.
+    /// </summary>
+    public sealed class NativeTrack : IResolutionTrack
+    {
+        public void Enqueue(CardInstance card)
+        {
+            throw new NotImplementedException();
+        }
+
+        public void Resolve(CombatContext context)
+        {
+            throw new NotImplementedException();
+        }
+    }
+}