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/Ns/IServiceGetterInterface.cs

@@ -2,6 +2,9 @@ namespace Ryujinx.HLE.HOS.Services.Ns
 {
     [Service("ns:am2")]
     [Service("ns:ec")]
+    [Service("ns:rid")]
+    [Service("ns:rt")]
+    [Service("ns:web")]
     class IServiceGetterInterface : IpcService
     {
         public IServiceGetterInterface(ServiceCtx context) { }