* random bluenoise projection with probabilistic hierarchy

* refreshed nanovg bindings and test

* forgot to check in file

* initial CADAG GUI work

* added hash stack functions

* fixed tukdag for new GLMain interface

* GLMain, GUI, DockGUI no longer use global handlers

* improvements to FIR

* cube rendering

* rasterize keyword works

* removed stages, added rangetype

* renamed image types

* changed `uvec` and `fvec` types to `vectype`

* `draw` supports viewport
* moved func argument for both `dispatch` and `draw`

* small change in dispatch syntax

* rewrote lowering

* typer can deduce stages

* fixed constant folding expression

support for `clear`

* low level support for rasterization