Show last user to update content

[markconroy]

Closes #856

What does this change?

• Removes 'author' from content list
• Adds 'last updated by' instead
• Adds exposed filter for 'last updated by' (but this users user id instead of user name, so needs some work)

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Thanks to Big Blue Door for sponsoring my time to work on this.

[finnlewis]

Notes from Merge Tuesday:

• this is not ready to be merged
• the user id wants to be displayed as a user name

[finnlewis]

@markconroy I have this working locally now, with just core views config changes :)

Just pushed the changes, wanna give it a spin?

I got the tip off from here: https://drupal.stackexchange.com/questions/314561/views-exposed-filter-cant-input-username-to-filter-only-works-with-user-id

:)

[markconroy]

Works a treat. Approved.