Require ReadArray and WriteArray to be called with a trivially copyable
type.

ReadArray and WriteArray call std::fread and std::fwrite respectively.
These functions trigger undefined behavior when the objects are not
trivially copyable, so this adds that requirement to the callers.

When performing a default compilation with recent GCC & glibc,
the use of -Werror=nonnull causes a build error.

The error is given as IOFile::ClearError() can call std::clearerr()
with a null file, which can trigger a null-pointer dereference in libc.

Change the std::clearerr() call to be conditional on a file being open.

A deep-copy method CopyReader has been added to BlobReader (virtual) and all of its subclasses (override). This should create a second BlobReader to open the same set of data but with an independent read pointer so that it doesn't interfere with any reads done on the original Reader.

As part of this, IOFile has added code to create a deep copy IOFile pointer onto the same file, with code based on the platform in question to find the file ID from the file pointer and open a new one. There has also been a small piece added to FileInfo to enable a deep copy, but its only subclass at this time already had a copy constructor so this was relatively minor.