Show researched/unresearched status of recipes in the factory plan

[alethiophile]

Suggestion

As it stands, by default recipes that aren't researched aren't shown in the listing for adding new recipes. However, you can turn this on with a setting, and this is often useful for future planning especially in large overhaul mods.

When unresearched recipes are shown, you can see which recipes are researched or unresearched when you add the recipe to your plan. However, after adding the recipe, there's no indication of this. This makes it tricky to remember which recipes in a plan are already available, or to plan out your research to enable a given factory.

It would be nice if the plan view highlighted unresearched recipes somehow (and updated this indication as research progressed). Currently, the recipe icon is highlighted yellow for recipes that consume a byproduct. This is a bit of a minor concern, so perhaps that channel could be repurposed to show researched/unresearched. Alternatively, a new column could be added, and/or a note added to the recipe tooltip.