- switch to phpunit7

raise dependency on PHP 7.1
add dependency on doctrine/annotations
raise dependency on doctrine/cache 1.6
raise dependency on doctrine/collections 1.4
raise dependency on doctrine/common 2.7.1
raise dependency on doctrine/dbal 2.6
raise dependency on doctrine/instantiator 1.1
switch to symfony 3 and 4
switch to phpunit6

fix FTBFS from Koschei add patch for PHP 7.3 from
https://github.com/doctrine/doctrine2/pull/7431
use range dependencies

fix FTBFS from Koschei add patch for PHP 7.2 from https://github.com/doctrine/doctrine2/pull/6821