EFM side-channel/LD-G data extraction and processing support

[happycube]

As far as I know, there's no option to save the EFM data side channels and extract the LD-G data, which is used for English subs on later Japanese releases (SW:TPM is probably the most common on this side of the pond)

We should fix this :)

[happycube]

Original tweet from Foone:
"but I don't have any discs with LD-G that I know of (it's mainly japanese discs), and I don't know if anyone has developed LD-G support for domesday duplicator rips"

[happycube]

This should be part of a bigger (debug) output cleanup on ld-process-efm. Probably a full channel dump of EFM/EC'd data, which would be good for processing non-timecode disks where you can right now run an entire cycle and get nothing out of the process.