fgm/paragraphs_views: WIP on a Views formatter and widget to use an entityreference field as a source of dynamic content within a paragraph. @ 25afeb999cfdab96fdc77247c867acb36bf36cac

Frederic G. MARAND 25afeb999c First commit: skeleton in place.		7 gadi atpakaļ
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FieldFormatter	25afeb999c First commit: skeleton in place.	7 gadi atpakaļ
FieldWidget	25afeb999c First commit: skeleton in place.	7 gadi atpakaļ