block-buffer: improve safety comments, use MaybeUninit for internal buffer
#1081
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Marks private
uncheckedmethods asunsafeand documents their safety requirements. AddsSAFETYcomment for allunsafeuses. Use ofcopy_nonoverlappingensures that compiler will not generate unreachable panic branches. Use ofMaybeUninitremoves unnecessary initialization and helps to test that we do not read bytes which were not written by us.The code successfully passes MIRI tests, but I plan to test this implementation more thoroughly later.