feat: Minimal working p5/CoffeeScript setup

lib/loadp5.js

@@ -0,0 +1,17 @@
+export var p5;
+export var p5loaded = new Promise(async function(resolve, reject) {
+    var success = false;
+    try {
+	p5 = await import('https://cdn.jsdelivr.net/npm/p5/lib/p5.js');
+	console.log('CDN import of p5 OK');
+	success = true; }
+    catch(err) {
+	console.log('CDN import of p5 failed: ' + JSON.stringify(err));
+	try {
+	    p5 = await import('./p5.js');
+	    success = true; }
+	catch {}
+	console.log('Used local fallback for p5'); }
+    p5 = window.p5;
+    delete window.p5;
+    if (success) { resolve(); } else { reject(); }});