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Introduce safe, container-templated span-based I/O wrappers. Helps centralize some UNSAFE_BUFFERS() usage. -- Add spanread/spanwrite overloads for FILE*. -- Add spanread/spanwrite overloads for POSIX file descriptors. -- Add spanread/spanwrite overloads for Windows HANDLE. -- Change FileAccessIface::Write() signature to return bool. -- Update image_diff, write.cc, file_util, and cfx_folderfontinfo. -- Update CFX_FileAccess_Posix to use FD wrappers. -- Update CFX_FileAccess_Windows to use HANDLE wrappers. -- Update TemporaryFileTest to use safe spanwrite wrapper. -- Add unit tests for all overloads in span_util_unittest.cpp. Note that CFX_FileAccess_Posix changes may have fixed a latent error underflow bug in the process. Change-Id: Ic2c4088d364be0a2f38c5d30854a61fdacc6c69d Reviewed-on: https://pdfium-review.googlesource.com/c/pdfium/+/149030 Commit-Queue: Tom Sepez <tsepez@chromium.org> Reviewed-by: Lei Zhang <thestig@chromium.org>