Issue #2891935 by maxocub, Jo Fitzgerald, heddn: Refactor D7 FieldInstance source plugin and other field instance related source plugins

(cherry picked from commit 4ff7617a)

Issue #2776975 by joelpittet, dawehner, tim.plunkett, xjm, pfrenssen: March 3, 2017: Convert core to array syntax coding standards for Drupal 8.3.x RC phase

Issue #2675470 by Jo Fitzgerald, hussainweb: D7 field instance settings for any fields not on nodes are not migrating

Issue #2665992 by alexpott, klausi, heykarthikwithu, xjm, tstoeckler: @file is not required for classes, interfaces and traits

Issue #2416765 by phenaproxima, miguelc303, hussainweb, mikeryan, benjy, chx: Migrate Drupal 7 Field/Instance/View mode settings