* gcore-shaders: fix missing `num-traits/libm` features
* graster-nodes: fix missing cfg on use statements
* shaders: use unchecked Color constructors
* graster-nodes: remove async from shader nodes not needing it
* gcore-shaders: remove explicit fn pointer
* graster-nodes: make kurbo std-only
* graster-nodes: replace glam reexport with normal dep
* gcore: impl Display for ProtoNodeIdentifier
* unify glam workspace dep
* raster-nodes: remove commented out index node
* raster-nodes: move `CubicSplines` to separate mod
* raster-nodes: create `mod blending_nodes` and move assoc nodes
* raster-nodes: move node `gradient_map` to its own mod