Merge branch 'f-move-entity' into f-async-execute

CHANGELOG.md

CMakeLists.txt

Makefile

conanfile.py

doc/README_SETUP.md

include/caosdb/data_type.h

include/caosdb/entity.h

include/caosdb/protobuf_helper.h

requirements.txt

src/caosdb/entity.cpp

src/caosdb/file_transmission/file_reader.cpp

src/caosdb/file_transmission/file_writer.cpp

test/test_entity.cpp