improve file.hpp

Signed-off-by: Jack <jack.wgm@gmail.com>
add bencode.hpp

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update rangefield.hpp

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implement integer_to_str function

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comment strtoll

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improve file.hpp

Signed-off-by: Jack <jack.wgm@gmail.com>
improve rangefield, add range_size, bitfield_to_range ...

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fixed bitfield_to_range

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improve breakpoint continue.

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update vcproject for test

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