buffer: added Buffer methods to r/w 24 bits integers.
Added readInt24LE() readInt24BE(), readUInt24LE(), readUInt24BE(), writeInt24LE() writeInt24BE(), writeUInt24LE(), writeUInt24BE(). Added tests.
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Added readInt24LE() readInt24BE(), readUInt24LE(), readUInt24BE(), writeInt24LE() writeInt24BE(), writeUInt24LE(), writeUInt24BE(). Added tests.