Debugger UI skeleton.

src/Xenia.Debug/BreakpointList.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using Xenia.Debug.Utilities;
+
+namespace Xenia.Debug {
+  public class BreakpointList : Changeable {
+    private readonly List<Breakpoint> breakpoints = new List<Breakpoint>();
+
+    public void Add(Breakpoint breakpoint) {
+    }
+
+    public void Remove(Breakpoint breakpoint) {
+    }
+
+    public void Clear() {
+    }
+  }
+}