Global multiplier for recipes

[KasperOmsK]

Some games (Minecraft comes in mind) would benefit from a global multiplier for recipes.

For instance (this is my current use case, so sorry to use Minecraft specific lingo, but I think this should benefit to other games too):

• I want to build N slice of a MIS storage
• Simply input the requirements for 1 slice
• Set the global modifier to N

Currently, you have to compute each requirements times N manually. If you misjudged N, you then have to re-compute and re-input each resource manually.

I have not really looked at the codebase, so I don't know how complex this would be to implement, but if this features seems worth it to maintainers, I'd be more than happy to submit a PR.