improve library code generation, add versioning

rollup.config.js

@@ -0,0 +1,13 @@
+import { version } from "./package.json";
+
+// rollup.config.js
+export default {
+  input: "dist/core/src/ts/core/index.js",
+  output: {
+    file: "dist/core.js",
+    format: "iife",
+    name: "odoo",
+    extend: true,
+    outro: `exports.core.version = '${version}';`
+  }
+};