warnings as errors, more warning flags

CMakeLists.txt

common/cpp/include/asapo/request/request_pool.h

common/cpp/include/asapo/unittests/MockHttpClient.h

common/cpp/include/asapo/unittests/MockIO.h

common/cpp/src/asapo_fabric/fabric_factory_not_supported.cpp

common/cpp/src/database/encoding.cpp

common/cpp/src/database/mongodb_client.cpp

common/cpp/src/database/mongodb_client.h

common/cpp/src/http_client/curl_http_client.cpp

common/cpp/src/system_io/system_io_mac.cpp

common/cpp/unittests/database/test_encoding.cpp

common/cpp/unittests/logger/test_logger.cpp

common/cpp/unittests/request/test_request_pool.cpp

consumer/api/cpp/src/consumer_c_glue.cpp

consumer/api/cpp/src/consumer_impl.cpp

consumer/api/cpp/src/consumer_impl.h

consumer/api/cpp/src/tcp_connection_pool.h

consumer/api/cpp/unittests/test_consumer_impl.cpp

examples/consumer/simple-consumer-c/consume.c

examples/pipeline/in_to_out/in_to_out.cpp