isokit: engine core, theme and Rhai scene runtime with prefab library

crates/isokit-theme/Cargo.toml

@@ -0,0 +1,9 @@
+[package]
+name = "isokit-theme"
+description = "isokit themes: TOML palettes, materials and rules -> CSS"
+version.workspace = true
+edition.workspace = true
+license.workspace = true
+
+[dependencies]
+toml = { workspace = true }