Arrays of value classes

[felixmulder]

The initial work on Arrays of value classes was completed by @VladimirNik. The current state of Arrays of value classes is described within this PR: #1228

If anyone wants to pick this up - you're more than welcome to pick up from this PR.

[DarkDimius]

In case @VladimirNik is not reachable, feel free to also ask me, as I've proposed the original idea.

[smarter]

Closing with stat:revisit (see #3706 to know what this means) since this is unlikely to be worked on in the near future.