Deep-copy LinkGoto data members

In PageData::convertLinkActionToLink, all data needs to be deep-copied.
Doing otherwise leads to heap allocation problems.
6 jobs for deep-copy-linkactions in 10 minutes and 2 seconds (queued for 29 seconds)
latest
Status Job ID Name Coverage
  Build
passed #1605974
build

00:03:40

passed #1605979
build_android

00:01:08

passed #1605975
build_clang_libcpp

00:03:24

passed #1605978
build_clazy

00:07:43

passed #1605977
build_mingw64_fedora

00:03:13

passed #1605976
build_ubuntu_16_04

00:01:34