Motivation

This is part of #1002
Closes #1029
Closes #1030

Summary of changes

wip

How to test it?

To create a new version:

• New version button
• Go all way down and submit the form.
• In versions index, you can see all the versions + the one you just created.
• You can see everything in it, edit it, etc.

What to check:

• The game will use the current one, if you mark as current a new one, everything should work as expected.
• Everything should be properly associated, without losing any record.

Known issues and next steps:
#1028

Checklist

• Tested the changes locally.
• Reviewed the changes on GitHub, line by line.
• This change requires new documentation.
  • Documentation has been added/updated.