Tests: update for current code and expose invisible tests to group based
testing

refactoring dynamic parameter handling, part 4

This finally adjusts the tests. It also adds getLimit and getOffset in
the search class.

added classes config parameter

This allows users to set custom CSS classes on aggregations potentially
restyling them differently for different use cases.

This makes startScope and finishScope part

added classes config parameter

This allows users to set custom CSS classes on aggregations potentially
restyling them differently for different use cases.

This makes startScope and finishScope part of the public API of the
Aggregation class. It should no longer be called within render() but is
instead called outside.

This might potentially break plugins implementing their own
aggregations. Needs to be checked

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fixed flaky test

It was depending on timing.

more test fixes

tests should succeed again

Mostly replacements for PHPQuery were needed.

clean up for the tests

This mostly corrects file and class names for PSR-2. Function names have
not been adjusted yet