Global import of modules

[ryuukk_]

https://forum.dlang.org/post/csnqfrweyiplmuhofojw@forum.dlang.org

That is a nice idea, but i think it is better if it is supported 
by the compiler directly, so even if you don't use dub, you get 
to use the feature


    dmd hello.d --global-module=first.d,second.d,third.d

This would allow me to do that: 
https://github.com/dlang/druntime/pull/3790

What is everyone's opinion?