Implement TermGroup UpdateBehavior.

[rompenar]

Update TermGroup properties: Description, Contributors, Managers.
Update TermSet properties: Name (same id), Description, IsOpenForTermCreation, IsAvailableForTagging, CustomProperties.
Update Term properties: Name (same id), Description, IsAvailableForTagging, Labels, CustomProperties, LocalCustomProperties.

[pschaeflein]

@rompenar - I'm struggling to understand the change. You've created a method named CreateTermGroup, and this method returns a tuple that includes a boolean. And the boolean indicates whether the group is new? This seems odd - I would expect a method with that name to create a term group, or throw if something goes wrong.

Was there an error you were fixing? Or is this an optimization of the code? Some more details would be helpful.

Thanks.

[rompenar]

@pschaeflein

The boolean return value is needed for the "modelTermGroup.Name == "Site Collection"" condition in the CreateTermGroup. When the group to create is the site collection one (<pnp:TermGroup Name="{sitecollectiontermgroupname}" ...), we use the methods termStore.GetSiteCollectionGroup which does not set the Contributors and Managers properties. We use the boolean value to avoid update when it's a new group, but to force it for new site collection group.

This change was made to implement the UpdateBehavior property on TermGroup, TermSet and Term object.