NR/RVT-R dumping support (WIP)

[RibShark]

This is a WIP PR for dumping NR/RVT-R discs via an upcoming version of OmniDrive.
NR/RVT-R discs differ from normal Nintendo discs in the following ways:

• Scrambling is applied to all sectors, including DMI/PFI, so these must be obtained and descrambled manually. Note that the sector layout for DMI/PFI is normal (CPR_MAI not shifted to end of sector).
• Nintendo Key for scrambling is fixed at 0x9 for the entire disc, with no additional offset, including lead-in and LBA 0-15.
• Book type in PFI is standard for DVD-R, so the logic for detecting Nintendo discs in split was modified to instead search for Nintendo in the DMI, and Emu in the same string to detect a dev disc.
• In OmniDrive, NR/RVT-R discs return a capacity of 1, but the full capacity when the PFI is queried (the drive fakes the PFI). This is used to detect Nintendo dev discs in dump, but I'm not sure if XGD3s with no video partition also appear like this? If so, logic will need to be changed.

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[superg]

Will try to review this week, Nintendo likes it complicated!