Refactor voc_classes for consistency

[sau1812]

Closes #286

[cregouby]

Hello @sau1812,

Thanks a lot for this contribution !

Unfortunately, those changes have to be made on top of two recent / in-the-making addition to the repo. Sorry for that, I should have been more explicit in the issue.
So would you be kind to wait a bit (for the #280 and # 284) to be merged before reviewing your change proposal ?

Sorry for this and thanks for your patience and involvement !

[sau1812]

Hi @cregouby, thank you for the feedback! I understand completely. I will wait for #280 and #284 to be merged first. Once they are in, I'll update my branch and handle any conflicts. Happy to help!

[cregouby]

Hello @sau1812,

The code baseline is now ready for you to proceed.

Happy coding !

[sau1812]

Hi @cregouby,

I have updated the PR by syncing with the latest main branch:

Conflict Resolution: Manually resolved conflicts in R/models-deeplabv3.R.

Consistency: Successfully renamed voc_classes to pascal_voc_classes throughout the file to match the new project baseline.

Thank you for your patience, ready for review!