Shaders: add gcore-shaders and make graster-nodes no-std (#2925)

* gcore-shaders: add crate, move `color` and `blending` from gcore

* gcore-shaders: move `AsU32`

* gcore-shaders: move `ChoiceType`, switch `Cow` for `&str`, adjust node macro

* gcore-shaders: move `registry::types`

* gcore-shaders: move `context::Ctx`

* raster-nodes: make it `no_std` with `std` feature

* gcore-shaders: fix doctest

node-graph/gcore/Cargo.toml

@@ -14,10 +14,12 @@ wgpu = ["dep:wgpu"]
 dealloc_nodes = []
 
 [dependencies]
+# Local dependencies
+graphene-core-shaders = { workspace = true, features = ["std"] }
+
 # Workspace dependencies
 bytemuck = { workspace = true }
 node-macro = { workspace = true }
-num-derive = { workspace = true }
 num-traits = { workspace = true }
 rand = { workspace = true }
 glam = { workspace = true }
@@ -30,7 +32,6 @@ rand_chacha = { workspace = true }
 bezier-rs = { workspace = true }
 specta = { workspace = true }
 image = { workspace = true }
-half = { workspace = true }
 tinyvec = { workspace = true }
 parley = { workspace = true }
 skrifa = { workspace = true }
@@ -46,9 +47,3 @@ wgpu = { workspace = true, optional = true }
 # Workspace dependencies
 tokio = { workspace = true }
 serde_json = { workspace = true }
-
-[lints.rust]
-# the spirv target is not in the list of common cfgs so must be added manually
-unexpected_cfgs = { level = "warn", check-cfg = [
-	'cfg(target_arch, values("spirv"))',
-] }