Shaders: more graster-nodes no-std fixups (#3090)

* 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

node-graph/gcore/src/types.rs

@@ -1,6 +1,7 @@
 use std::any::TypeId;
 
 pub use std::borrow::Cow;
+use std::fmt::{Display, Formatter};
 use std::ops::Deref;
 
 #[macro_export]
@@ -160,6 +161,12 @@ impl Deref for ProtoNodeIdentifier {
 	}
 }
 
+impl Display for ProtoNodeIdentifier {
+	fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
+		f.debug_tuple("ProtoNodeIdentifier").field(&self.name).finish()
+	}
+}
+
 fn migrate_type_descriptor_names<'de, D: serde::Deserializer<'de>>(deserializer: D) -> Result<Cow<'static, str>, D::Error> {
 	use serde::Deserialize;