link type in WP

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specify type endpoints

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add meta data to type (created, updated)

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add color to type

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Merge remote-tracking branch 'origin/dev' into feature/specify_patchable_type

Conflicts:
	doc/apiv3-documentation.apib

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Use more idiomatic Chai assertions for booleans

Signed-off-by: Alex Coles <alex@alexbcoles.com>
Activate ngAria
Test that possible assignees/responsibles behave the same
Unify possible assignees/responsibles behavior
Refactor spec
Test that group are correctly handled by WP form endpoint
Test that WP patch respects group assignment setting
Test that assignable responsibles can contain groups
Test that it is possible to assign groups as responsibles
Test that it is allowed to assign a group as responsible

There isn't a validation for this yet. But also assignee misses
such a validation. I left a TODO, so others are reminded to fix
this globally someday.
Allow to assign groups as responsibles
Merge pull request #2337 from opf/feature/chai-assertions-booleans

Use more idiomatic Chai assertions for booleans
Validate group assignment is activated
Fix indentation
Fix focus reset after deleting a relation