MLECO-3164: Additional refactoring of KWS API

Part 1
* Add KwsClassifier
* KwsPostProcess can now be told to average results
* Averaging is handlded by KwsClassifier
* Current sliding window index is now an argument of DoPreProcess

Change-Id: I07626da595ad1cbd982e8366f0d1bb56d1040459
diff --git a/tests/use_case/object_detection/InferenceTestYoloFastest.cc b/tests/use_case/object_detection/InferenceTestYoloFastest.cc
index d328684..ff70bf9 100644
--- a/tests/use_case/object_detection/InferenceTestYoloFastest.cc
+++ b/tests/use_case/object_detection/InferenceTestYoloFastest.cc
@@ -20,7 +20,7 @@
 #include "TensorFlowLiteMicro.hpp"
 #include "DetectorPostProcessing.hpp"
 #include "InputFiles.hpp"
-#include "UseCaseCommonUtils.hpp"
+#include "BufAttributes.hpp"
 
 namespace arm {
     namespace app {