Introduce counterSource to more easily distribute the counter

[lmbollen]

What (what did you do)
Make counter distribution consistent across demos.

Why (context, issues, etc.)
To improve both consistency and routing in of the different demos.

Dear reviewer (anything you'd like the reviewer to pay close attention to?)
Does it matter that we now get undefined contents out of the counter for the first n cycles? I don't think so. and it is also easier to place + route + optimize for vivado.

AI disclaimer (heads-up for more than inline autocomplete)
No AI here

[martijnbastiaan]

Does it matter that we now get undefined contents out of the counter for the first n cycles? I don't think so. and it is also easier to place + route + optimize for vivado.

The reset should be aligned with what the counter calls "zero", but it's okay if it looks like this:

in reset:   1   1   0   0   0   0   0
counter:    X   X   X   X   2   3   4

I think that's what you're currently doing, but you could make it more obvious by adjusting the initial contents of the counter to be 0 - delay instead of repeatedly calling - 1.