New condition: Contains for lists

Issue information

From user: danielspeicher

Related to !349 (merged) !339 (closed)

Contribution record

Fork management

Problem/Motivation

It would be convenient to have contains function for lists.

Example:
Content is ['ab',2,'gh',5]

Now we can write a condition plugin, that checks if the string 'ui' is present, which is not the case here.

We can assume, that we get an iterable and use foreach to check every element.