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/Nifm/IStaticService.cs

@@ -1,3 +1,5 @@
+using Ryujinx.HLE.HOS.Services.Nifm.StaticService;
+
 namespace Ryujinx.HLE.HOS.Services.Nifm
 {
     [Service("nifm:a")] // Max sessions: 2

Ryujinx.HLE/HOS/Services/Nifm/StaticService/GeneralService/GeneralServiceManager.cs

@@ -1,7 +1,7 @@
 using System.Collections.Generic;
 using System.Linq;
 
-namespace Ryujinx.HLE.HOS.Services.Nifm
+namespace Ryujinx.HLE.HOS.Services.Nifm.StaticService.GeneralService
 {
     static class GeneralServiceManager
     {

Ryujinx.HLE/HOS/Services/Nifm/StaticService/GeneralService/Types/GeneralServiceDetail.cs

@@ -1,4 +1,4 @@
-namespace Ryujinx.HLE.HOS.Services.Nifm
+namespace Ryujinx.HLE.HOS.Services.Nifm.StaticService.GeneralService
 {
     class GeneralServiceDetail
     {

Ryujinx.HLE/HOS/Services/Nifm/StaticService/IGeneralService.cs

@@ -1,11 +1,12 @@
 using Ryujinx.Common.Logging;
+using Ryujinx.HLE.HOS.Services.Nifm.StaticService.GeneralService;
 using System;
 using System.Linq;
 using System.Net;
 using System.Net.NetworkInformation;
 using System.Net.Sockets;
 
-namespace Ryujinx.HLE.HOS.Services.Nifm
+namespace Ryujinx.HLE.HOS.Services.Nifm.StaticService
 {
     class IGeneralService : IpcService, IDisposable
     {

Ryujinx.HLE/HOS/Services/Nifm/StaticService/IRequest.cs

@@ -4,7 +4,7 @@ using Ryujinx.HLE.HOS.Kernel.Common;
 using Ryujinx.HLE.HOS.Kernel.Threading;
 using System;
 
-namespace Ryujinx.HLE.HOS.Services.Nifm
+namespace Ryujinx.HLE.HOS.Services.Nifm.StaticService
 {
     class IRequest : IpcService
     {