Issue #2570985 by ifrik, chipway, lomasr, jhodgdon, shimpy, govind.maloo, vacho, Balu Ertl, Manjit.Singh, alexpott, Bojhan, volkswagenchick, mradcliffe, xjm, tkoleary, yoroy, no_angel, dawehner, webchick, Sam152, RuslanP, Gábor Hojtsy, wengerk, wla_g: Update the module descriptions on the Extend page

Issue #3072702 by alexpott, Wim Leers, mikelutz, xjm, catch, Berdir, tedbow, webchick, shaal, Mixologic, heddn: Core extensions should not need to specify the new core_version_requirement in *.info.yml files so that 9.0.x can be installed

Issue #2798891 by ankitjain28may, trobey, TR: Define project dependencies in core module .info files

Issue #2406749 by dawehner, YesCT, amateescu, hussainweb, kim.pepper, RavindraSingh, pwolanin, Wim Leers, Gábor Hojtsy, yched, jibran: Use a link field for custom menu link

Issue #2301239 by pwolanin, dawehner, Wim Leers, effulgentsia, joelpittet, larowlan, xjm, YesCT, kgoel, victoru, berdir, likin, and plach: MenuLinkNG part1 (no UI or conversions): plugins (static + MenuLinkContent) + MenuLinkManager + MenuTreeStorage.