Fourth Draft: Primary Type Syntax

[Quirin Schroll]

The obligatory 
[permalink](https://github.com/Bolpat/DIPs/blob/fcb076e4be19abf634bcadbb7567c49ed80c084c/DIPs/DIP-2NNN-QFS.md) and [latest draft](https://github.com/Bolpat/DIPs/blob/PrimaryTypeSyntax/DIPs/DIP-2NNN-QFS.md).

The only difference is new subsections of [§ Maximal Munch 
Exceptions](https://github.com/Bolpat/DIPs/blob/fcb076e4be19abf634bcadbb7567c49ed80c084c/DIPs/DIP-2NNN-QFS.md#maximal-munch-exceptions).