Use generator multichoice in callout and visual container

[IvanKiral]

Motivation

Which issue does this fix? Fixes #issue number

If no issue exists, what is the fix or new feature? Were there any reasons to fix/implement things that are not obvious?

Checklist

• Code follows coding conventions held in this repo
• Automated tests have been added
• Tests are passing
• Docs have been updated (if applicable)
• Temporary settings (e.g. variables used during development and testing) have been reverted to defaults

How to test

If manual testing is required, what are the steps?

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[JiriLojda]

I moved the CalloutType into another file as it didn't really fit into the perCollection.ts file. Otherwise it looks good.