Ability to hide a tech

[matheod]

TL;DR : ability to hide a tech we know we don't want to search for now

Hello,

I think it would be good if we were able to hide a tech we know we don't want to search for now.

That way it would be easier to focus on other tech.

For exemple, right clicking on a tech could turn it gray and put it at the bottom on the list (even under completed tech). Right cliking on a hided tech would bring him back at the top.