Feature/Steam Workshop support

[FliesWithWind]

Description

For a while, I had a horrible but working script for downloading and updating Arma 3 mods from Steam Workshop. I figured it was about time I try adding it to LinuxGSM. The script was based on https://github.com/arkmanager/ark-server-tools

Changes in this PR are working, but are far from being pretty or complete in my opinion. I'm no bash magician, so I wanted to show it as it is, hoping for an initial review and suggestions.

I've added it as a separate module, to avoid conflicts with the current mods module.
For now, it downloads mods for Arma 3 taken from the server config file.

workshopmods="450814997;2131302796"

Once we reach a working and pretty solution, the next steps would be to add support for other games, like Arc and Starboud, and add Steam Collections support.

Fixes #[3514] #[1894] #[1623] #[960]

Type of change

• Bug fix (a change which fixes an issue).
• New feature (a change which adds functionality).
• New Server (new server added).
• Refactor (restructures existing code).
• Comment update (typo, spelling, explanation, examples, etc).

Checklist

PR will not be merged until all steps are complete.

• This pull request links to an issue.
• This pull request uses the develop branch as its base.
• This pull request subject follows the Conventional Commits standard.
• This code follows the style guidelines of this project.
• I have performed a self-review of my code.
• I have checked that this code is commented where required.
• I have provided a detailed enough description of this PR.
• I have checked if documentation needs updating.

Documentation

Documentation will definitely need an update, once this is ready for merge. :)

[dgibbs64]

I did not mean to do that

[dgibbs64]

@FliesWithWind please can you open a new PR. I messed up

[FliesWithWind]

Sure thing @dgibbs64. No worries :)

[github-actions]

This pull request has been automatically locked since there has not been any recent activity after it was closed. Please open a new issue for related bugs.