Add bigger clearances on hot paths for more safety

[ri0t]

Ahoi!
Nice design. I suggest adding a little bit more clearance to possibly hot pathways.
This (comprehensive and handy) list of safe and "deadly" AC->USB-converters shows a lot of examples on how to do it right (and how not):
https://lygte-info.dk/info/ChargerIndex%20UK.html

Here's a picture of a unit wich was tested against 4kV.
One trick is to use non-conducting material (e.g. hot glue) for isolation purposes, but this makes everything very messy.

[oxullo]

Thanks for the hint and the link, I keep this issue open for a future revision C!