Version 1.6.4

Added

• Add function data() to get the not yet read data from a pbf_reader.
• New add_packed_fixed() template function for pbf_writer.
• New length_of_varint() helper function calculates how long a varint would be for a specified value.

Changed

• More consistent implementation of operators as free friend functions.

Fixed

• Fixed some zigzag encoding tests on MSVC.
• Add extra cast so we do an xor with unsigned ints.
• No more bitwise operations on signed integers in varint decoder.
• No more bitwise operations on signed integers in zigzag encoder/decoder.