Previously there was a split where some of the services were in the
Service namespace and others were not.

Implemented FSUser::CreateExtSaveData

cfg:s, ptm:sysm, apt:s.
apt:s is almost exactly the same as apt:u as per 3dbrew

I couldn't find any information about this service...

Apparently nothing at all is known about this service...

in the service's headers

This was automated using `clang-modernize`.

Most functions already operate on std::strings. This also removes the need to manually null terminate thread names.

- various cleanups

- various cleanups/refactors to HLE services