Shaders: graster-nodes no-std fixups (#2984)

* wgpu-executor: remove useless features

* wgpu-executor: cleanup copy-pasted code

* gcore-shaders: no_std fixups

node-graph/gcore-shaders/src/registry.rs

@@ -20,5 +20,6 @@ pub mod types {
 	/// DVec2 with px unit
 	pub type PixelSize = glam::DVec2;
 	/// String with one or more than one line
+	#[cfg(feature = "std")]
 	pub type TextArea = String;
 }