Use safe arithmentic in CFX_BinaryBuf::ExpandBuf.

Always call ExpandBuf(), and if it returns, we know the
subsequent calculations won't overflow.

Also use std::unique_ptr, and fix unintentional copies thus
detected by its suppressed copy ctor in fsdk_baseform.cpp

Also Remove unused CFX_BinaryBuf::TakeOver(), AppendFill(), CopyData().

Also remove operator= in favor of using <<, for similarity
with std::ostream and friends.

Also move ByteStringC methods to CFX_ByteTextBuf sub-class.

Also re-order members, may pack tighter on 64-bits.

R=thestig@chromium.org

Review URL: https://codereview.chromium.org/1710403002 .

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