Implement XCI Encrypted Header parsing

[jakcron]

Functionality Changes

• Implemented decrypting & parsing XCI encrypted header data.
• xci_header_key is now parsed from prod.keys/dev.keys.

  Code Changes

• Added xci_header_key to nca_keyset_t and updated extkeys.c to populate that member.
• Added AES_MODE_CBC to aes_mode_t as AES-CBC is required to decrypt the header data.
• Defined xci_gamecard_info_t and associated enums:
  • gamecard_firmware_version_t
  • gamecard_access_control_t
  • xci_region_compatibility_t.
• Updated xci.c/xci.h to support decrypting header data and outputting data to stdout.

  Information Source

• See https://switchbrew.org/wiki/Gamecard_Format

[SciresM]

Thanks! :)