cleanup, refactor and document ForeignKeyConstraint asset
cleanup, refactor and document ForeignKeyConstraint asset

drieschel/dbal,stchr/dbal,gencer/dbal,mariuz/dbal,stof/dbal,LionwareSolutions/dbal,webonyx/dbal,doctrine/dbal,deeky666/dbal,DHager/dbal,LionwareSolutions/dbal,cassvail/dbal,kimhemsoe/dbal,wuxu92/dbal,PowerKiKi/dbal,PowerKiKi/dbal,nfrignani/dbal,v-bartusevicius/dbal,lafourchette/dbal,kupishkis/dbal,shivergard/dbal,janschoenherr/dbal,mihai-stancu/doctrine-dbal,kupishkis/dbal,zeroedin-bill/dbal,nfrignani/dbal,mariuz/dbal,mRoca/dbal,sarcher/dbal,adrienbrault/dbal,easybiblabs/dbal,arima-ryunosuke/dbal,PowerKiKi/dbal,janschoenherr/dbal,bspeterson/dbal,gencer/dbal,DataSyntax/dbal,vutung2311/dbal,tk-s/dbal,doctrine/dbal,mRoca/dbal,vortgo/dbal,zeroedin-bill/dbal,BenMorel/dbal,Tobion/dbal,webonyx/dbal,easybiblabs/dbal,lafourchette/dbal,arima-ryunosuke/dbal,DataSyntax/dbal,hason/dbal,mikeSimonson/dbal,bspeterson/dbal,lcobucci/dbal,tk-s/dbal,easybiblabs/dbal,stchr/dbal,v-bartusevicius/dbal,sarcher/dbal,BenMorel/dbal,AlexDpy/dbal,kupishkis/dbal,mbeccati/dbal,sarcher/dbal,kimhemsoe/dbal,hason/dbal,mathroc/dbal,mbeccati/dbal,mihai-stancu/doctrine-dbal,deeky666/dbal,stof/dbal,vortgo/dbal,mihai-stancu/dbal,lcobucci/dbal,helicon-os/doctrine-dbal,mariuz/dbal,wuxu92/dbal,mihai-stancu/dbal,webonyx/dbal,shivergard/dbal,cassvail/dbal,arima-ryunosuke/dbal,LionwareSolutions/dbal,adrienbrault/dbal,Tobion/dbal,adrienbrault/dbal,drieschel/dbal,hason/dbal,vutung2311/dbal,DHager/dbal,AlexDpy/dbal,mathroc/dbal,helicon-os/doctrine-dbal,mikeSimonson/dbal