Merge branch 'develop' of https://stash.desy.de/scm/asapo/asapo into feature_ASAPO-146-create-shared-libraries-for-clients

* commit '67a15924':
  Add pkg-config files for consumer and producer APIs

* commit 'c9412a7b':
  change bool to int in C++ glue code
  update tests, changelog
  fix mem error
  producer accepts auto id
  get rid of broker dependency in tests
  fix tests
  get rid of mongodb transactions
  initial version of auto id

* commit '6d36a5b0':
  refactor and fix memleak
  fix memleak
  add C API tests for datasets
  refactor error handling
  refactor C API
  add tests for consumer C API, fix bugs
  fix memory leak in test
  remove unistd.h dependency
  add some missing funtions
  add tests for C, fixed some places
  switched C code to snake_case
  now with generc asapoString and some more functions
  more consumer functions, now also with Doxygen doc
  c-api version that does compile
  c header wityh reasonable content
  now with simple consumer example
  new header and glue code for C api
  c header wityh reasonable content
  now with simple consumer example
  new header and glue code for C api