Merge branch 'f-async-execute' into f-acm

conanfile.py

doc/CHANGELOG.md

include/caosdb/authentication.h

include/caosdb/entity.h

include/caosdb/file_transmission/download_request_handler.h

include/caosdb/file_transmission/upload_request_handler.h

include/caosdb/logging.h

include/caosdb/transaction.h

include/caosdb/transaction_status.h

include/caosdb/unary_rpc_handler.h

src/caosdb/authentication.cpp

src/caosdb/connection.cpp

src/caosdb/file_transmission/download_request_handler.cpp

src/caosdb/file_transmission/upload_request_handler.cpp

src/caosdb/logging.cpp

src/caosdb/transaction.cpp

src/caosdb/transaction_handler.cpp

src/caosdb/unary_rpc_handler.cpp

test/test_entity.cpp

test/test_issues.cpp