Extend REQUIRED_PHP_EXTENSIONS check about core extensions (#1540)
Extend REQUIRED_PHP_EXTENSIONS check about core extensions (#1540)

* Extend Grocy REQUIRED_PHP_EXTENSIONS

After installing Grocy on FreeBSD, even with all extensions installed that are listed in REQUIRED_PHP_EXTENSIONS, Grocy still couldn't start. The added 3 PHP Extensions are also needed to run Grocy.

* Added note about core extensions

Co-authored-by: Bernd Bestel <537fbe67df61ff679eb89705ad76a7f1c4e05f51@berrnd.de>
berrnd/grocy,berrnd/grocy,berrnd/grocy,berrnd/grocy