Add file output in yolov7 demo#57

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TigranIM wants to merge 3 commits intoNirAharon:mainfrom

TigranIM:add-file-output-in-yolov7-demo

Commits on Nov 28, 2022

Added file output from --save-txt in yolov7 demo #32.
Tigran Nalbandyan
committed
Corrected the style.
Tigran Nalbandyan
committed
Added an additional check for save_txt.
Tigran Nalbandyan
committed