Switching themes from custom.html

I was trying Bangle.load(shadowclk.app.js) from the REPL, but I will try load("shadowclk.app.js") as well.

In many ways it might actually be better to just add a global option in the app loader that said "load app after upload" or something?

I'm sure some people would appreciate the option. For now I just have a message displayed saying "Hold the button on Bangle.js" after they upload the config they want