yolo2_light_cpu - XNOR-INT8

• This release includes both XNOR and INT8
• In next release INT8 will be removed.

yolo2_light_cpu_v1.2

before adding actual BIT1-XNOR part.
before #define GEMMCONV adding - it was removed but will be included in future release.

yolo2_light_cpu

• more clean source
• yolov3 options are almost removed
• supports only yolov3
• only support object detection

yolo2_light_cpu

• This is cpu only simulation version.
• gpu and cuDNN options are cleaned.
• no optimization.