`Character` attachment to `Story` - CMS side

[mikron-ia]

Make it possible to link Character to Story, in order to make a list of actors participating in the Story. This is likely to be an n:n relation.

• Link - DB level
• Setting it both ways
• Display on Story side as actors (CMS)
• Display on Character side as roles (CMS)

This may make the Description participation type less useful, but keep it - it may be useful for more detailed notes later.

[mikron-ia]

This will likely require split for CMS and front part, along with a few more tasks for advanced functionality