Move WP attribute definition for details pane to client
Pass enabled project modules to plug-ins' WP attribute hook

We first assumed that it would be sufficient to resolve the enabled project
modules by examining the API response. But that is not true if a module is
actually enabled but a property is not rendered because of privacy
restrictions (for instance).
Add service for WP details management
Show grouped WP attributes
Adapt styles for row based layout
Adapt empty value hiding to grouped layout
Adapt tests to modified WP attribute handling
Remove tests that become deprecated
Implement sorting of attributes group 'other'
Localize group names
Add method for adding WP attribute groups
Add method to check enabled modules
Rework method behavior
Refactor tests
Rename attribute group
If no position specified put at the end
Cut off long WP attribute names
Improve WP attribute list layout
Adapt styleguide to grouped WP attributes
Use HTML DL element instead of UL