FP16 support in serialization

* Allow serialization of fp16 data
* Add package to support integrated half data-type (half_float::half), independent of native float: http://half.sourceforge.net/
* Allow passing of accumulate data-type in serialization

Signed-off-by: James Ward <james.ward@arm.com>
Change-Id: I54357f02e3776d81958228f699ea5044f2014f4b
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 87e0825..e53aa3e 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -27,6 +27,8 @@
 option(BUILD_TESTS "Build test applications" ON)
 option(FLATBUFFERS_ROOT "Location where the flatbuffers 'include' and 'lib' folders to be found" Off)
 
+include_directories(${PROJECT_SOURCE_DIR}/third_party/half/include)
+
 include_directories(${CMAKE_CURRENT_SOURCE_DIR}/include)
 
 add_library(tosa_serialization_lib