HLE/FS: Document some command parameters and implemented command 0x08560240 (CreateLegacySystemSaveData)

ForeachDirectoryEntry didn't actually do anything with the `recursive`
parameter, and the corresponding callback parameter was shadowing the
actual recursion counters in the user functions.

This allows us to get the addressing operation for STRT, LDRT, STRBT,
and LDRBT. We do this so that translation functions don't need to
see the addressing ops directly.

Revert "Split huge interpreter source file into translation info and interpreter (+ some tiny misc style fixes)"

To facilitate the split, some small changes were made to names of
various structures and functions.

This is part of an ongoing effort to implement support for multiple processes.

Specifically, dlp::CLNT and dlp::FKCL

Moves them to their own folder like with other services.