Auto-generate enum type widget boilerplate for radio buttons and dropdown menus (#2589)

* First draft of factoring out the dropdown boilerplate

* Add proc macro for enum boilerplate

* Detect whether to say `crate` or the name

* Clean up the input and naming of the enum macro

* Rename a file

* Do the rename of code too

* Use the attribute-driven selection of radio vs dropdown

* Add a metadata struct and tooltips

* Move the new traits to a better place.

* Use ChoiceType, part 1

* Use ChoiceType, part 2

* Introduce a builder API for choice widgets

* Start using the new new API

* DomainWarpType should be a dropdown still

* Handle the case where a node property can never have a socket

* Rustfmt

* Code review

* Update stable node IDs in test

---------

Co-authored-by: Keavon Chambers <keavon@keavon.com>

node-graph/gcore/src/ops.rs

@@ -533,22 +533,16 @@ fn extract_xy<T: Into<DVec2>>(_: impl Ctx, #[implementations(DVec2, IVec2, UVec2
 	}
 }
 
+/// The X or Y component of a vector2.
 #[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
 #[cfg_attr(feature = "std", derive(specta::Type))]
-#[derive(Debug, Clone, Copy, Default, PartialEq, Eq, Hash, DynAny)]
+#[derive(Debug, Clone, Copy, Default, PartialEq, Eq, Hash, DynAny, node_macro::ChoiceType)]
+#[widget(Dropdown)]
 pub enum XY {
 	#[default]
 	X,
 	Y,
 }
-impl core::fmt::Display for XY {
-	fn fmt(&self, f: &mut core::fmt::Formatter<'_>) -> core::fmt::Result {
-		match self {
-			XY::X => write!(f, "X"),
-			XY::Y => write!(f, "Y"),
-		}
-	}
-}
 
 // TODO: Rename to "Passthrough"
 /// Passes-through the input value without changing it. This is useful for rerouting wires for organization purposes.