convert from goostring to utf8

6 jobs from master in 12 minutes and 10 seconds (queued for 2 seconds)
latest
Status Job ID Name Coverage
  Build
passed #89794
build

00:03:35

passed #89799
build_android

00:01:12

passed #89795
build_clang_libcpp

00:03:19

passed #89798
build_clazy

00:03:54

passed #89796
build_gcc_49

00:04:03

passed #89797
build_mingw64_fedora

00:12:09