Make it a ChageNotifier and try to access it through the Provider
instead of like a global variable. This way, the state is better
managed and it'll be easier to split out Settings into smaller classes.
The iOS updates keep getting rejected, and I think it's because
RevenueCat is taking too long to respond. Additionally, revenueCat
doesn't really give us anything useful as its receipt validation isn't
perfect, and I've had to roll my own.
Plus from a privacy point of view, this is better as we are no longer
talking to any third party service.
This has so far only been tested on iOS
Putting a column inside a SingleChildScrollView is way way too complex.
There are lots of different solutions, and not all seem to work for me.
Also adjust the loading screen.
