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

raise dependency on doctrine/data-fixtures 1.1
allow doctrine/persistence 2
allow phpdocumentor/reflection-docblock 5

raise dependency on symfony/polyfill 1.15

raise dependency on doctrine/persistence 1.3

- add ErrorHandler component
- drop dependency on fig/link-util
- raise dependency on symfony/contracts 1.1.8
- raise dependency on doctrine/doctrine-bundle 1.5
- raise dependency on monolog/monolog 1.25.1
- allow twig 3 (review #1774967)
- allow doctrine-bundle 2 (review #1775102)
- add dependency on sodium extension
- add dependency on guzzlehttp/promises