Assemblers should show in the UI that output blocks

[Hexicube]

A relatively simple change for new players. If the assembler has enough in all outputs to cause inserters to not want to add more items, the output slots should tint yellow. If any outputs are full, those slots should tint red instead.

[Jap2.0]

There's a mod for that.™

[JohnyDL]

I use/love bottleneck and logistics bottleneck to do that

Also how do you tint outputs when there's no defined outputs on assemblers, yes there is for fluid things but any inserter in any position might be the input or output