Keeping the pointer creates use-after-free opportunities, and we don't
have much reason to keep it around anyway.

ESCore implements the core functionality that can also be used outside of emulation. ESDevice implements the IOS device and is only available during emulation.

Obsoletes these functions in favor of the standard member functions
added in C++20.

When searching for a disc where the revision doesn't match any disc in
the datfile, the loop would never get to the part where serials_exist is
set to true, leading to a bogus error message.

allows verifying dev-signed discs and wads

Just for ease of reading. No behavioral difference.

Previously, we had WBFS and CISO which both returned an upper bound
of the size, and other formats which returned an accurate size. But
now we also have NFS, which returns a lower bound of the size. To
allow VolumeVerifier to make better informed decisions for NFS, let's
use an enum instead of a bool for the type of data size a blob has.