Gadgetbridge fullscreen notifications

[AverageMarcus]

⚠️ This requires #130 to first be merged

Added support for fullscreen notifications to the Gadgetbridge app.

Settings page updated to support enabling fullscreen notifications or keeping current slide-down notifications.

Also added the ability to turn off notifications completely and to hide the widget icon.

[gfwilliams]

This looks good - I guess potentially rather than checking for notify.app.js you could do Bangle.loadWidgets and then see if global.ShowFullscreenNotification exists?

That way, it'd be pretty easy for others to create different apps to display notifications in different ways.

In fact - there are some other options here...

• Add Bangle.showNotification, and then make the gadgetbridge top bar implementation into another app that just implements Bangle.showNotification - so you can install an app that displays notifications whatever way you want.
• Turn your fullscreen notifications into a "fullscreen gadgetbridge" app. Realistically that might actually be more sensible - since I guess to make it a really good experience you'll want quite a tight coupling between gadgetbridge and the notifications - maybe displaying icons depending on the service type (whatsapp/hangouts/etc)

[gfwilliams]

So this one basically includes notify.js as well?

Not sure if you've seen #155 but it seems to be abstracting out the 'draw notification' and looks like a good fit.

I'll leave this open and when I get a sec I'll try and do what we did for locale, which is to set it up so you can have apps that create a notify module in storage.

More info on #162

[gfwilliams]

Closing this one for now - see my comment on #130 (comment)

have added a simple notify (top of screen as before) and notifyfs app, which create something that allows you to require("notify").show(...). Apps can also set a dependency so that a notification library gets loaded automatically if one doesn't exist.

It should provide a nice way for anything to create a notification, and notifications should now be able to be customised by installing a new app - to make them fullscreen or otherwise.

However there is no notification history at the moment - I guess that could be added though? Maybe the library could create a Bangle.on('notification'...) event that we could then hook onto with a notification history app?