fix: < & > are parsed with HTML escape symbols (#481)

Adds utils.htmlDecode arround innerHTML to read the code for <py-repl> and
<py-script>, which preserves all newlines, tabs, and < & > characters.

Fix bug #480

pyscriptjs/src/components/pyscript.ts

@@ -40,7 +40,7 @@ export class PyScript extends BaseEvalElement {
 
     connectedCallback() {
         this.checkId();
-        this.code = this.innerHTML;
+        this.code = htmlDecode(this.innerHTML);
         this.innerHTML = '';
 
         const mainDiv = document.createElement('div');