Array Picker: Filter arrays by key, exclude items or match rules

This class can filter arrays by key, exclude items or matching rules.

It can take a given associative array and return the entry with a given index or a given default value if the index does not exist.

The class can also return the whole array except a given index if it exists.

It can also return the array filtered using a given set of conditions that determine the keys of the elements to include or exclude.