Dev csv (#761)

* import cultures feature

* remove debug messages

* code cleanup

modules/io/formats.js

@@ -0,0 +1,19 @@
+"use strict"
+
+window.Formats = (function () {
+  async function csvParser (file, separator=",") {
+    const txt = await file.text();
+    const rows = txt.split("\n");
+    const headers = rows.shift().split(separator).map(x => x.toLowerCase());
+    const data =  rows.filter(a => a.trim()!=="").map(r=>r.split(separator));
+    return {
+      headers,
+      data,
+      iterator: function* (sortf){
+        const dataset = sortf? this.data.sort(sortf):this.data;
+        for (const d of dataset)
+          yield Object.fromEntries(d.map((a, i) => [this.headers[i], a]));
+      }};
+  }
+  return {csvParser};
+})();