* spl: Implement IGeneralInterface GetConfig
This PR implement the GetConfig call of the spl service. This is currently needed for some homebrews which currently needs Ignore Missing Service to boot. Now it's fixed.
Implementation was done using Atmosphère code and REing too.
* Addresses gdkchan feedback
* 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