add bitfield.hpp

Signed-off-by: Jack <jack.wgm@gmail.com>
update vc2012 project file

Signed-off-by: Jack <jack.wgm@gmail.com>
change range_to_bitfield support to bitfield

Signed-off-by: Jack <jack.wgm@gmail.com>
update avhtt.hpp header

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