Inserter Filtering as a Tech Unlock

[Sad_Brother]

Filtering Inserters are quite useful early game for limiting purpose for example. I always use it on loading stations to split belt to chests equally.

4/ Option to place Inserter/Assembler/whatever from blueprint, but disable until proper technology unlocked, seems the best option now. Blueprint could be printed whole, while some parts are obviously inoperable. More of this: Blueprint could give "Tech absent" error and cannot be printed except forced. Boskid did not mention this option so may be Devs would change something.

I would quite like this as it opens a way to further improve inserter without new inserters.