mylocation: custom locations

let the user configure all the App settings by an interface.html in the app loader

There were a few discussions about this before, and I think that while it's definitely an improvement in quality of life, to do it you're probably going to end up duplicating all the settings code, which will make apps much harder to maintain. I bet there'll be more bugs, settings out of sync (some in the Bangle but not on the Desktop, some that don't work, and so on). It feels like the issues from that would probably outweigh the benefits.

There's a possibility to maybe run the app on the phone but the overwrite E.showMenu so the menus appear on the PC, but again some apps try and do fancy things with E.showMenu which probably wouldn't work when relayed to the PC, and I think that having something that doesn't work reliably is worse than not having it at all in this case