authPDO: extend mysql test to ensure multiple groups are read

I noticed that all our tests basically only ever used one group per
user. This makes sure multiple groups work as intended.

add needed type hints for phpunit8

This will break a lot of plugin tests, but can't be avoided

PSR-2 for authpdo plugin

mark some tests as non-risky

Those tests either just check that an exception is NOT thrown or are
there to check dependencies for other tests. Newer phpunits mark all
tests as risky that have no ass

mark some tests as non-risky

Those tests either just check that an exception is NOT thrown or are
there to check dependencies for other tests. Newer phpunits mark all
tests as risky that have no assertion.

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authpdo: fix group filter

The filter passed by the user manager is called 'grps' not 'group'

authpdo: fix return type of retrieveUsers() #1781

authpdo: fix wrong return type for getUserCount() #1781

skip tests if sqlite or pdo is missing

user listing and counting added

added user deletion

usermodification works now

user and group creation works now

added user group selection

began work on PDO auth plugin