Issue #3426955 by mstrelan, sorlov, alexpott, smustgrave, godotislate: Convert ViewsField plugin discovery to attributes

Issue #3181778 by quietone, longwave, aldairsoares, beatrizrodrigues, Aline Teixeira Ramos, KapilV, raman.b, anushrikumari, CChiste, mallezie, Ratan Priya, rakesh.regar, Kevin.Notari, vicheldt, mauryarahul11, yogeshmpawar, bbrala, alexpott, bruno.bicudo: [w/c September 17th] Replace t() with $this->t() in all plugins

Issue #2935255 by Jo Fitzgerald, kim.pepper, voleger, alexpott, martin107, jibran, catch: Remove all usages of drupal_get_message and drupal_set_message in core lib

Issue #2935256 by Jo Fitzgerald, voleger, kim.pepper, ibustos, Yogesh Pawar, catch, jibran: Remove all usages of drupal_get_message and drupal_set_message in modules

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

Issue #2644598 by mglaman, bojanz, vasike: Views forms can't be used multiple times on the same page