Groundwork for integrating Specta (#949)

* add derive(specta::Type)

* use specta from git

* introduce Uuid type

* remove unnecessary specta::Type

* document export_types test

* upgrade Specta
The previous Specta branch had some hacks that were just for this project. They have all been converted into proper features so they can be merged into main.

* remove some unnecessary specta::Type uses

* add MessageDiscriminantDef explanation

* manually export types with specta

* rename 'specta.rs' to 'export_types.rs'

* rename 'export_types' to 'generate_ts_types'

---------

Co-authored-by: Oscar Beaumont <oscar@otbeaumont.me>

node-graph/gcore/src/raster/color.rs

@@ -18,7 +18,7 @@ use bytemuck::{Pod, Zeroable};
 #[repr(C)]
 #[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
 #[cfg_attr(feature = "gpu", derive(Pod, Zeroable))]
-#[derive(Debug, Clone, Copy, PartialEq, Default, DynAny)]
+#[derive(Debug, Clone, Copy, PartialEq, Default, DynAny, specta::Type)]
 pub struct Color {
 	red: f32,
 	green: f32,