Hot reloading support

Good morning,

I was just asking if hot reloading is supposed to work, because when I open the platformer demo and try to change the script and save the simulation stops.

Thanks

Start by reproducing the issue in the platformer demo: edit the script, save it, and observe the simulation stopping. Trace the hot-reloading path for the JavaScript binding and define done as saving a script no longer stopping the simulation and applying the change during the running demo.

Written by the indexing model from the issue text.