Dealing with function/class parameter Phpstan errors

[Dianne Tennent]

Fixing syntax errors in preparation for PHP8 upgrade. This patch does not include 3rd party libraries.

e.g. Class SystemException constructor invoked with 0 parameters, 1-2 required.

e.g. Parameter #1 $parser of method dbQuerySet::_tag_close() is not passed by reference but parameter #1 $parser of method dbObject::_tag_close() is passed by reference.

These can be verified by running;
phpstan analyse htdocs

And searching for "parameter" and "parameters"

[Mahara Bot (dev-mahara)]

Patch for "main" branch: https://reviews.mahara.org/12289