Issue #3064854 by markcarver, andypost, johnwebdev, lauriii, ridhimaabrol24, Hardik_Patel_12, Charlie ChX Negyesi, jhodgdon, aleksip, alexpott, Fabianx, Chi, Wim Leers: Allow Twig templates to use front matter for metadata support

Issue #2877994 by Lendude, Krzysztof Domański, mahmoud-zayed, joseph.olstad, caspervoogt, gngn, timomueller, cri2mars, pavlosdan, aleksip, johndevman, paper boy, patrickroma, Bessonweb, alexpott, tibbsa, ConradFlashback, larowlan, DuneBL, jess_m, arakwar: Entity Links fields does not have translation support

Issue #2337283 by hussainweb, Mile23, alexpott, aleksip, dawehner, heykarthikwithu, naveenvalecha, Crell, xjm, davidwbarratt, Fabianx, jhedstrom, tim.plunkett, larowlan, tstoeckler: Add a composer.json file to every component

Issue #2281691 by xjm, mikeryan, Gábor Hojtsy, alexpott, tim.plunkett, webchick, abhishek-anand, quietone, yoroy, stevepurkiss, benjy, Bojhan, Ryan Weal, aleksip, anavarre, hussainweb, er.pushpinderrana, cilefen, Luukyb, Jo Fitzgerald: User interface for migration-based upgrades

Issue #2313241 by aleksip, benjy: Fixed d6_taxonomy_term migrate fails when the parent term has not been already migrated.