Add save as xml / load xml features
How to test this MR.
- Create any program as usual and run it. Make sure the program run as expected.
- Click "Download as XML" button. Make sure the browser downloads an xml file.
- Remove the blocks, click "Choose File" button, and select the downloaded xml file. Make sure the previously created blocks reappears.
- Click Run button and make sure the program runs as expected.
@elana99 can you take a look at this MR with the testing instructions above?