WIP: fix conan setup

conanfile.py

include/caosdb/configuration.h

include/caosdb/info.h

include/caosdb/logging.h

include/caosdb/transaction.h

src/caosdb/configuration.cpp

src/caosdb/connection.cpp

src/caosdb/file_transmission/download_request_handler.cpp

src/caosdb/logging.cpp

src/caosdb/protobuf_helper.cpp

src/caosdb/transaction.cpp

test/test_data_type.cpp