Adding --save-conf to test.py and detect.py

[ghost]

1. Adding --save-conf option to detect.py and test.py
2. Adding --output option to test.py
   3 Honoring --save-txtoption intest.py`

Inspired by: #994

🛠️ PR Summary

_{Made with ❤️ by Ultralytics Actions}

🌟 Summary

Added options to save detection confidences in output text files and to specify custom output directories during testing.

📊 Key Changes

• 🔧 Introduced a save_conf argument to include confidence scores in saved text files.
• 💾 Added output command-line argument to specify a custom output directory for results.
• 🛠 Modified the text file saving logic to accommodate confidence scores if save_conf is enabled.
• 📂 Changed the default output path to be within a provided save_dir.

🎯 Purpose & Impact

• 📈 Enhanced flexibility: Users can now save detection confidences, aiding in better analysis and post-processing.
• 🗂 Custom output organization: The ability to set a custom output directory helps users keep their results organized.
• 🎛 More control for users: These updates give users greater control over the testing output, which can be useful for various applications and workflows.

[github-actions]

Hello @oboiko-chegg, thank you for submitting a PR! To allow your work to be integrated as seamlessly as possible, we advise you to:

• Verify your PR is up-to-date with origin/master. If your PR is behind origin/master update by running the following, replacing 'feature' with the name of your local branch:

git remote add upstream https://github.com/ultralytics/yolov5.git
git fetch upstream
git checkout feature  # <----- replace 'feature' with local branch name
git rebase upstream/master
git push -u origin -f

• Verify all Continuous Integration (CI) checks are passing.
• Reduce changes to the absolute minimum required for your bug fix or feature addition. "It is not daily increase but daily decrease, hack away the unessential. The closer to the source, the less wastage there is." -Bruce Lee

[glenn-jocher]

@oboiko-chegg thanks for the PR. By coincidence I just updated and merged PR #994 today. This means there will be a conflict with detect.py, and also that these #1175 additions will have a different implementation.

Can you update this PR here to conform to the new format as shown in #994? Thanks! https://github.com/ultralytics/yolov5/pull/994/files

[ghost]

I will close this one and open a new one