IDebuggableProcess: Create and expose interface to enable implementation of debugging tools

# Conflicts:
#	src/ARMeilleure/State/DebugState.cs
#	src/ARMeilleure/State/ExecutionContext.cs
TODO: Fix comments. I also tried implementing AppleHV primitives here (it's actually broken).

src/Ryujinx.HLE/HOS/Kernel/Process/ProcessExecutionContext.cs

@@ -31,6 +31,19 @@ namespace Ryujinx.HLE.HOS.Kernel.Process
         {
         }
 
+        public void DebugStop()
+        {
+        }
+
+        public bool DebugStep()
+        {
+            return false;
+        }
+
+        public void DebugContinue()
+        {
+        }
+
         public void StopRunning()
         {
             Running = false;