optimize update routine (#171)
optimize update routine (#171)

* rmeove old connector tables and only update specific stuff when installed previously

* php-cs-fixes

jochenmanz/plentymarkets-shopware-connector,jochenmanz/plentymarkets-shopware-connector,pwnyprod/plentymarkets-shopware-connector,plentymarkets/plentymarkets-shopware-connector,Pfabeck/plentymarkets-shopware-connector,plentymarkets/plentymarkets-shopware-connector,ReverseRetail/plentymarkets-shopware-connector,pwnyprod/plentymarkets-shopware-connector,ReverseRetail/plentymarkets-shopware-connector,Pfabeck/plentymarkets-shopware-connector