Allows DV7toDV8.sh script to work on non-Mac hardware

[ajyey]

This MR allows the script to run on non-mac hardware.

My home media server runs on Linux and I do most of my work there, so being able to run this on Linux seemed like it would also be helpful for other users.

This MR:

• Adds support for additional command line arguments
• Updates the README to reflect those arguments
• Slightly rewords some things in the README
• Only prompts the user for language codes via applescript if the user is running on a Mac and they have not passed in the language codes via command line argument

[ajyey]

@nekno thoughts?

[nekno]

Hi @ajyey! Thanks for your patience (while I've been traveling) and these contributions!

I've requested some changes for you to approve/make while I test out these changes on macOS.

[nekno]

Unless you're moving the script or the mkv files into the same folder each time, the one required param for the script has been the target directory.

It's perfectly fine to support that use case, but what do you think about defaulting to the present working directory (as you've done) but then setting targetDir here, as the one unlabeled argument, rather than using the -t/--target label?

I think it's more common that you wouldn't be moving the files around, the script will have a home and your working files will be in different folders each time, so I think using an unlabeled arg for the target directory makes the most sense.

If -t/--target were to be required, then we'd need to update the Platypus app config file to reflect this change in the script as part of this PR.

[ajyey]

Updated. Let me know what you think 👍