change return-type of make functions from shared_ptr to unique_ptr

4 jobs for issue/filewriter_unique_ptr in 19 minutes and 28 seconds (queued for 15 seconds)
Status Job ID Name Coverage
  Test
passed #7257
debian:10 clang-6-libcpp-17

00:19:27

passed #7256
debian:10 gcc-8-17

00:15:58

passed #7258
debian:9 gcc-6-14

00:13:10

passed #7259
ubuntu:18.04 clang-6-17

00:18:29