Issue #3252386 by alexpott, longwave, duadua, mondrake, mstrelan, andypost, Spokje, VladimirAus, catch, effulgentsia, Berdir, xjm, bircher, joachim, larowlan: Use PHP attributes instead of doctrine annotations

Issue #2861210 by tetranz, borisson_, zuuperman, axel.rutz, alexpott: Local tasks are not shown after enabling module

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

Issue #2624594 by pwolanin, lauriii, Xano: Local action plugins do not have any way to provide cacheability metadata

Issue #2541344 by Wim Leers, borisson_, DietrichM, Xano, tim.plunkett, alvar0hurtad0, joshi.rohit100: BlockBase subclasses should merge their cache tags/contexts with the parent's (BlockBase's)

Issue #2600538 by rakesh.gectcr, anil280988, justAChris, jhodgdon: Incorrect @file description in core/ classes - wrong namespace or class name

Issue #2511516 by lauriii, Xano, Wim Leers, dawehner: Make local tasks and actions hooks provide cacheability metadata, to make the blocks showing them cacheable

Issue #507488 by lauriii, mdrummond, Wim Leers, Manuel Garcia, pwolanin, davidhernandez, chx, jibran, andypost, dawehner, Xano, tuutti, Gábor Hojtsy, LewisNyman, maximiliam, eiriksm, borisson_, bill richardson, Fabianx, joelpittet, Jeff Burnz, xjm, webchick, Bojhan, EclipseGc, emma.maria, tim.plunkett: Convert page elements (local tasks, actions) into blocks

Issue #2077473 by dawehner, damiankloip, pwolanin: Replace local action plugin discovery with YamlDiscovery and handle routes with parameters.

Issue #2018411 by ParisLiakos, tim.plunkett, msonnabaum: Figure out a nice DX when working with injected translation.

Issue #2050227 by damiankloip, pwolanin: Add local action plugin deriver to use YAML discovery for static definitions.