Refactoring HOS folder structure (#771)

* Refactoring HOS folder structure

Refactoring HOS folder structure:

- Added some subfolders when needed (Following structure decided in private).
- Added some `Types` folders when needed.
- Little cleanup here and there.
- Add services placeholders for every HOS services (close #766 and #753).

* Remove Types namespaces

Ryujinx.HLE/HOS/Services/Am/AppletAE/AllSystemAppletProxiesService/LibraryAppletCreator/ILibraryAppletAccessor.cs

@@ -0,0 +1,73 @@
+using Ryujinx.Common.Logging;
+using Ryujinx.HLE.HOS.Ipc;
+using Ryujinx.HLE.HOS.Kernel.Common;
+using Ryujinx.HLE.HOS.Kernel.Threading;
+using Ryujinx.HLE.HOS.Services.Am.AppletAE.Storage;
+using System;
+
+namespace Ryujinx.HLE.HOS.Services.Am.AppletAE.AllSystemAppletProxiesService.LibraryAppletCreator
+{
+    class ILibraryAppletAccessor : IpcService
+    {
+        private KEvent _stateChangedEvent;
+
+        public ILibraryAppletAccessor(Horizon system)
+        {
+            _stateChangedEvent = new KEvent(system);
+        }
+
+        [Command(0)]
+        // GetAppletStateChangedEvent() -> handle<copy>
+        public ResultCode GetAppletStateChangedEvent(ServiceCtx context)
+        {
+            _stateChangedEvent.ReadableEvent.Signal();
+
+            if (context.Process.HandleTable.GenerateHandle(_stateChangedEvent.ReadableEvent, out int handle) != KernelResult.Success)
+            {
+                throw new InvalidOperationException("Out of handles!");
+            }
+
+            context.Response.HandleDesc = IpcHandleDesc.MakeCopy(handle);
+
+            Logger.PrintStub(LogClass.ServiceAm);
+
+            return ResultCode.Success;
+        }
+
+        [Command(10)]
+        // Start()
+        public ResultCode Start(ServiceCtx context)
+        {
+            Logger.PrintStub(LogClass.ServiceAm);
+
+            return ResultCode.Success;
+        }
+
+        [Command(30)]
+        // GetResult()
+        public ResultCode GetResult(ServiceCtx context)
+        {
+            Logger.PrintStub(LogClass.ServiceAm);
+
+            return ResultCode.Success;
+        }
+
+        [Command(100)]
+        // PushInData(object<nn::am::service::IStorage>)
+        public ResultCode PushInData(ServiceCtx context)
+        {
+            Logger.PrintStub(LogClass.ServiceAm);
+
+            return ResultCode.Success;
+        }
+
+        [Command(101)]
+        // PopOutData() -> object<nn::am::service::IStorage>
+        public ResultCode PopOutData(ServiceCtx context)
+        {
+            MakeObject(context, new IStorage(StorageHelper.MakeLaunchParams()));
+
+            return ResultCode.Success;
+        }
+    }
+}