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Suggestion to introduce improved SCREEN macros.
Our current screen showing code contains _getItem and _getNumItems that depend on each other quite a lot.
In previous PR's i introduced SCREEN macro and an approach to merge these two function into one _internal function.
However, this was a bit hacky and not general.
Here I try to generalize the approach so that it can be used on all screens, while making it more straightforward. It is stil a bit complex, due to the fact, that _internal function implements two interfaces at once, but I believe now, besides this, it is all very natural.