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/Hid/HidServer/IAppletResource.cs

@@ -0,0 +1,31 @@
+using Ryujinx.HLE.HOS.Ipc;
+using Ryujinx.HLE.HOS.Kernel.Common;
+using Ryujinx.HLE.HOS.Kernel.Memory;
+using System;
+
+namespace Ryujinx.HLE.HOS.Services.Hid.HidServer
+{
+    class IAppletResource : IpcService
+    {
+        private KSharedMemory _hidSharedMem;
+
+        public IAppletResource(KSharedMemory hidSharedMem)
+        {
+            _hidSharedMem = hidSharedMem;
+        }
+
+        [Command(0)]
+        // GetSharedMemoryHandle() -> handle<copy>
+        public ResultCode GetSharedMemoryHandle(ServiceCtx context)
+        {
+            if (context.Process.HandleTable.GenerateHandle(_hidSharedMem, out int handle) != KernelResult.Success)
+            {
+                throw new InvalidOperationException("Out of handles!");
+            }
+
+            context.Response.HandleDesc = IpcHandleDesc.MakeCopy(handle);
+
+            return ResultCode.Success;
+        }
+    }
+}