Deprecate function values in utils since it became part of JS

[cirossmonteiro]

This function could be removed and its calls updated to use current standard of Javascript.

[josdejong]

Good point! Fixed via 5c12c07

[cirossmonteiro]

@josdejong Nice! Another ocurrence here.

[josdejong]

Ah, yes. Can you find even more occurences?

[cirossmonteiro]

Nope, I think that's the last one.

[cirossmonteiro]

BUT... BUT... I guess the same replacements could be applied on array.contains
since JS has array.includes

[josdejong]

Ok addressed via e37bacd and d97f338.

I've also replaced occurrences of .indexOf(...) === -1 and .indexOf(...) !== -1 with .contains(...).