It allows persistent object to use volatile data. It is
implemented as global volatile hash_map which maps PMEMoids
to pointers to volatile data. The hash_map is protected by
read write lock (available from C++14 hence this is the
requirement for the entire feature).

Volatile state stored in hash_map is cleared on pool close
(only the state which is conncted to pmem objects from the
closed pool).

this is neccessary for volatile_state implementation.

to pool and transaction classes description.

It's now possible to register callback for transaction. This implementation
uses pmemobj C tx callback internally but the user is able to
register multiple callbacks for each transaction stage.

Do not run anything on appveyor

Windows builds are now being run on github actions.

Add running tests on Github Actions for Windows

Merge changes from stable-1.8

Not passing required flags caused error on windows. Also including
libpmemobj.h cause inclusion of type macros which would case problems
with offsetoff deifnition on newer VS.

Concurrent hash map does not depend on v<>.

this allows vcpkg integrate install to find the libraries. This allows
to run cmake without the need for specifying CMAKE_PREFIX_PATH

Add Windows build to GitHub Actions

Add ndctl and daxctl packages to satisfy install-pmdk

install-pmdk.sh script requires ndctl and daxctl packages
to be installed when installing PMDK from packages.

Segment vector doc fixes

After moving out of experimental, we oficially only support our own
3 policies. This patch removes information about specifics of those
policies - this is something which might change.

Print found version of clang-format in error message

Move segment_vector out of experimental

Set the commit range in case of GitHub Actions

It fixes rebuilding the image in case of GitHub Actions

Disabling it is not neccesary.

Change the default Policy of segment_vector
from exponential_size_array_policy to exponential_size_vector_policy.

enumerable_thread_specific has to have 'exponential_size_array_policy'
as Storage, because its storage must not do reallocations.

enumerable_thread_specific: fix

fixed datarace and test added

test: remove concurrent_hash_map_pmreorder_insert_erase_mt test

Multi-threaded tests cannot be run under pmreorder,
because pmreorder does not support multi-threaded tests.