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/CMakeLists.txt b/CMakeLists.txt
index 13d7077..8f5a0bd 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -184,7 +184,6 @@
             armnn
             ${Boost_SYSTEM_LIBRARY}
             ${Boost_PROGRAM_OPTIONS_LIBRARY}
-            ${Boost_FILESYSTEM_LIBRARY}
             ${Boost_THREAD_LIBRARY} )
 
     add_executable_ex(ArmnnQuantizer
@@ -196,7 +195,6 @@
     target_link_libraries(ArmnnQuantizer
             ${Boost_SYSTEM_LIBRARY}
             ${Boost_PROGRAM_OPTIONS_LIBRARY}
-            ${Boost_FILESYSTEM_LIBRARY}
             ${Boost_THREAD_LIBRARY} )
 
     target_link_libraries(ArmnnQuantizer
@@ -611,7 +609,7 @@
 install(DIRECTORY include/ DESTINATION ${CMAKE_INSTALL_INCLUDEDIR})
 
 target_link_libraries(armnn ${Boost_THREAD_LIBRARY}
-                            ${Boost_SYSTEM_LIBRARY} ${Boost_FILESYSTEM_LIBRARY})
+                            ${Boost_SYSTEM_LIBRARY})
 
 if(ARMCOMPUTENEON OR ARMCOMPUTECL)
     target_link_libraries(armnn ${ARMCOMPUTE_LIBRARIES})
@@ -1029,7 +1027,6 @@
     target_link_libraries(ArmnnConverter ${CMAKE_THREAD_LIBS_INIT})
     target_link_libraries(ArmnnConverter
         ${Boost_SYSTEM_LIBRARY}
-        ${Boost_FILESYSTEM_LIBRARY}
         ${Boost_PROGRAM_OPTIONS_LIBRARY})
     addDllCopyCommands(ArmnnConverter)
   endif()