IVGCVSW-4487 Remove boost::filesystem

 * Replace filesystem::path
 * Replace filesystem::exists
 * Replace filesystem::is_directory
 * Replace filesystem::directory_iterator
 * Replace filesystem::filesystem_error exception
 * Replace filesystem::temp_directory_path
 * Replace filesystem::unique path
 * Replace filesystem::ofstream with std::ofstream
 * Replace filesystem::remove
 * Replace filesystem::is_regular_file
 * Replace boost::optional with armnn::Optional in touched files
 * Remove some superfluous includes
 * Update build guides, GlobalConfig.cmake and CMakeLists.txt
 * Remove redundant armnnUtils::Filesystem::Remove function.
 * Remove redundant armnnUtils::Filesystem::GetFileSize function.

Temporarily adding back Boost::filesystem to enable Boost::dll.

Signed-off-by: Francis Murtagh <francis.murtagh@arm.com>
Signed-off-by: Colm Donelan <Colm.Donelan@arm.com>

Change-Id: Ifa46d4a0097d2612ddacd8e9736c0b36e365fb11
diff --git a/src/armnnTfLiteParser/test/LoadModel.cpp b/src/armnnTfLiteParser/test/LoadModel.cpp
index 9ae3412..9777333 100644
--- a/src/armnnTfLiteParser/test/LoadModel.cpp
+++ b/src/armnnTfLiteParser/test/LoadModel.cpp
@@ -6,6 +6,8 @@
 #include "ParserFlatbuffersFixture.hpp"
 #include "../TfLiteParser.hpp"
 
+#include <Filesystem.hpp>
+
 using armnnTfLiteParser::TfLiteParser;
 using ModelPtr = TfLiteParser::ModelPtr;
 using SubgraphPtr = TfLiteParser::SubgraphPtr;
@@ -196,8 +198,8 @@
 
 BOOST_FIXTURE_TEST_CASE(LoadModelFromFile, LoadModelFixture)
 {
-    using namespace boost::filesystem;
-    std::string fname = unique_path(temp_directory_path() / "%%%%-%%%%-%%%%.tflite").string();
+    using namespace fs;
+    fs::path fname = armnnUtils::Filesystem::NamedTempFile("Armnn-tfLite-LoadModelFromFile-TempFile.csv");
     bool saved = flatbuffers::SaveFile(fname.c_str(),
                                        reinterpret_cast<char *>(m_GraphBinary.data()),
                                        m_GraphBinary.size(), true);