Virtual Signal 'Appends' and Selector Combinator Improvements

[vitharr]

TL;DR

Utilize the concept of quality signals appending an item signal to further improve data readout and control via machines

What?

For a specific instance, the biochamber recipe for pentapod eggs requires both ingredient nutrients, and fuel nutrients, making it difficult to properly develop circuit conditions. Appending the fuel virtual signal onto the nutrients in the fuel slot would allow for determining the difference in a way that's already in use in the game engine, quality and its uses in the selector combinator

Why?

While just improving the pentapod recipe doesn't improve gameplay much, taking the idea further has interesting implications. Being able to differentiate whether rocket fuel is cargo or fuel easily in trains, or potentially opening up the ability to 'tag' items contained in wagons discretely by potentially giving the index of the cargo wagon an ID itself would be a large improvement to logistic controls. Having a selector combinator able to output filter the amount of wagon 1's cargo load rather than the full train's only, for example. Additionally, this could lead to the simplification of determining the difference between a train's requests vs its contents, finally allowing trains to carry their 'orders' and convey them to their stops appropriately