Further seperation of public templates vs private templates

Move the specializations for the ADIOS class members to thier own file

Fix -DHAVE_FEATURENAME macros to actually work

Added a contributors guide

Fixed a bug in DataManWriter which uses a wrong engine name

Added upstream remote in setup script

Reinstate the use of reinterpret_cast

Verified by @JasonRuonanWang 

Move from indent width from 2 -> 4

Conflicts:
	doc/API_design/API_example_use.cpp
	examples/groupless/basic/reader.cpp
	examples/groupless/basic/writer.cpp
	examples/groupless/compound/reader.cpp
	examples/groupless/compound/writer.cpp
	examples/groupless/multistep/reader_allsteps.cpp
	examples/groupless/multistep/reader_stepping.cpp
	examples/groupless/multistep/writer_multistep.cpp
	examples/heatTransfer/IO_adios2.cpp
	examples/heatTransfer/main.cpp
	examples/hello/adios1Writer/helloADIOS1Writer_nompi.cpp
	include/ADIOS.h
	include/capsule/shmem/ShmSystemV.h
	include/core/Method.h
	include/core/Support.h
	include/core/Variable.h
	include/engine/adios1/ADIOS1Reader.h
	include/engine/adios1/ADIOS1Writer.h
	include/format/BP1.h
	include/format/BP1Writer.h
	source/core/Method.cpp
	source/engine/adios1/ADIOS1Reader.cpp
	source/transport/file/FileDescriptor.cpp

Disable clang-format hooks.  It's more annoying than useful.

Fix gcc485 segfault

Using {} syntax for direct initialization of reference types in constructor
member initialization lists is broken on some compilers, even though it's valid
C++11 code.  Use () to ensure correctness.

Add examples as tests

Fix OpenMPi C++ binding issue for the whole project

Fix clang tidy issues round2