Refactor layout system and abstract data types to separate definitions and tags

src/window_dom.rs

@@ -0,0 +1,9 @@
+use crate::layout_abstract_syntax::*;
+
+pub struct WindowDom {}
+
+impl WindowDom {
+	pub fn new(root_component: &FlatComponent) -> WindowDom {
+		Self {}
+	}
+}