Another canvas overlaid for labeling debug views

Was having trouble with events not going through the top canvas, pointerEvents: none seems to work
WIP: setting up the debug viewport/canvas for debug blitting


WIP: sets up and clear the second canvas


WIP: Bliting texture seems to work


WIP: adding reference to labeling generator (to access debug textures)


dispatch -> dispatchWorkgroups


WIP: contours compute pass not working yet


switch back to showing contours buffer


Thanks for Matus, contour pass finally computes


Uncommenting shader code and stuff


WIP: adding ID texture to G buffer

thought I'd only do it for spheres and rounded cones but it produces invalid pipelines right now
Set up selection ID attachment in G buffer rendering


Matus saved the day once  :-)

WIP: refactoring labeling layout / debug viewport setup


WIP: restructured, outlines showing in debug viewport again


Moved webgpu objects to common graphics library places


Contours: output UVs for distance transform seed

still not working but I have all the webgpu structures in place

WIP: interfacing labeling algs with component/graphics lib

Testing with SVG overlaid over the canvas for now
Playing around with labels in SVG over canvas

updated chrome canary was giving the annoying warning already.