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 #2669964 by quietone, Gábor Hojtsy, Jo Fitzgerald, phenaproxima: Migrate Drupal 7 core node translations to Drupal 8

Issue #2807885 by phenaproxima, svendecabooter: Convert Field's Migrate source tests to new base class

Issue #2705977 by heddn, edysmp: D6/7->D8 migration: User role based block visibility settings doesn't filter missing roles

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