raw merge of dev branch

.gitignore

3d_party/libcurl/install.cmd

3d_party/libcurl/install.sh

3d_party/libcurl/install_VS2017.cmd

3d_party/mongo-c-driver/install.cmd

3d_party/mongo-c-driver/install.sh

3d_party/rapidjson/include/rapidjson/allocators.h

3d_party/rapidjson/include/rapidjson/document.h

3d_party/rapidjson/include/rapidjson/encodedstream.h

3d_party/rapidjson/include/rapidjson/encodings.h

3d_party/rapidjson/include/rapidjson/error/en.h

3d_party/rapidjson/include/rapidjson/error/error.h

3d_party/rapidjson/include/rapidjson/filereadstream.h

3d_party/rapidjson/include/rapidjson/filewritestream.h

3d_party/rapidjson/include/rapidjson/fwd.h

3d_party/rapidjson/include/rapidjson/internal/biginteger.h

3d_party/rapidjson/include/rapidjson/internal/diyfp.h

3d_party/rapidjson/include/rapidjson/internal/dtoa.h

3d_party/rapidjson/include/rapidjson/internal/ieee754.h

3d_party/rapidjson/include/rapidjson/internal/itoa.h