Refactor SVC handler (#540)

* Refactor SVC handler

* Get rid of KernelErr

* Split kernel code files into multiple folders

Ryujinx.HLE/HOS/Kernel/Ipc/KSession.cs

@@ -0,0 +1,31 @@
+using Ryujinx.HLE.HOS.Services;
+using System;
+
+namespace Ryujinx.HLE.HOS.Kernel.Ipc
+{
+    class KSession : IDisposable
+    {
+        public IpcService Service { get; private set; }
+
+        public string ServiceName { get; private set; }
+
+        public KSession(IpcService service, string serviceName)
+        {
+            Service     = service;
+            ServiceName = serviceName;
+        }
+
+        public void Dispose()
+        {
+            Dispose(true);
+        }
+
+        protected virtual void Dispose(bool disposing)
+        {
+            if (disposing && Service is IDisposable disposableService)
+            {
+                disposableService.Dispose();
+            }
+        }
+    }
+}