allow doctrine/persistence 3

all components now require symfony/polyfill-php80

drop dependency on ocramius/proxy-manager
add dependency on friendsofphp/proxy-manager-lts
raise dependency on doctrine_annotations_min_ver 1.10.4
raise dependency on doctrine/orm 2.6.3
raise dependency on twig/twig 1.43
sources from git snapshot

drop dependency on doctrine/reflection

raise dependency on symfony/contracts 1.1.10
http-kernel: add dependency on symfony/contracts