Refactor SVC handler (#540)

* Refactor SVC handler

* Get rid of KernelErr

* Split kernel code files into multiple folders

Ryujinx.HLE/HOS/Kernel/Common/KSynchronizationObject.cs

@@ -0,0 +1,35 @@
+using Ryujinx.HLE.HOS.Kernel.Threading;
+using System.Collections.Generic;
+
+namespace Ryujinx.HLE.HOS.Kernel.Common
+{
+    class KSynchronizationObject : KAutoObject
+    {
+        public LinkedList<KThread> WaitingThreads;
+
+        public KSynchronizationObject(Horizon system) : base(system)
+        {
+            WaitingThreads = new LinkedList<KThread>();
+        }
+
+        public LinkedListNode<KThread> AddWaitingThread(KThread thread)
+        {
+            return WaitingThreads.AddLast(thread);
+        }
+
+        public void RemoveWaitingThread(LinkedListNode<KThread> node)
+        {
+            WaitingThreads.Remove(node);
+        }
+
+        public virtual void Signal()
+        {
+            System.Synchronization.SignalObject(this);
+        }
+
+        public virtual bool IsSignaled()
+        {
+            return false;
+        }
+    }
+}