HwOpus service implementation (#201)

* Started to implement the hwopus service

* Write outputs on decode method, some basic error handling

* Fix buffer size read from header and check

* Fix order of values

Ryujinx.HLE/HOS/Services/ServiceFactory.cs

@@ -105,6 +105,9 @@ namespace Ryujinx.HLE.HOS.Services
                 case "ldr:ro":
                     return new IRoInterface();
 
+                case "hwopus":
+                    return new IHardwareOpusDecoderManager();
+
                 case "lm":
                     return new ILogService();