Debugger UI skeleton.

src/Xenia.Debug/Breakpoint.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 Breakpoint : Changeable {
+    // type code/data/kernel
+    // address+[end address]
+    // conditions? script?
+    // action (suspend, trace, etc)
+  }
+}