v1.1.0 - Restructure to Unity structure

This release is simply just refactoring the directory structure to exactly match Unity's internal structure, for sanity's sake.
There's a potential this breaks existing Simple Lit shader graphs, due to the movement of the .hlsl include files, but I've left them in the old location too (for now) so that shouldn't happen. But after save they'll reference the newer .hlsl files.

Full Changelog: v1.0.0...v1.1.0