Call for action: Easily improve D's ecosystem - DUB documentation improvements

[rikki cattermole]

I've filled in some details about shared libraries wrt. plugins the 
issue for it.

Will need compiler specific information CC: Walter, Martin, Iain.

Still massive shame that dmd is still a write off for Windows support 
when using D from D. Wahoo export + ModuleInfo + DLLs.

Oh and don't forget about the no Unicode exported on Windows!