First Draft: Primary Type Syntax

[Quirin Schroll]

https://github.com/Bolpat/DIPs/blob/a872d3b5602a45d1767d5acb962ba24becaa26ce/DIPs/DIP-2NNN-QFS.md

**Abstract**
The goal of this proposal is that every type construction 
expressible by D’s type system also has a representation as a 
sequence of D tokens. The type constructs that lack this are 
function pointer and delegate types that return by reference 
and/or have a non-trivial linkage.