refactoring van de cmap structuren bijna compleet

static/js/cmap/engine/drawing-core.js

@@ -0,0 +1,9 @@
+/**
+ * Internal exports of the modular diagram rendering core.
+ *
+ * The implementation is derived from the MIT-licensed ionstage/cmap 0.1.3
+ * renderer and is maintained as part of racket-wiki.
+ */
+export { DrawingLink, DrawingNode } from "./drawing-components.js";
+export { DrawingTriple } from "./drawing-relations.js";
+export { DrawingSurface } from "./drawing-surface.js";