Add Reloader App

[Sleuth56]

A very basic app to reload the Banglejs2 after an amount of time has passed. The goal of this app is to prevent crashing and memory leaks.

[thyttan]

Hi - thanks for your first PR! 🚀

I'm personally a little hesitant towards this approach. Could you please provide some background to why you needed this in the first place? Both as a rationale for the PR and so we can maybe fix the original problem.

Ideally we should strive to make the code on the watch not crash and not have memory leaks. If we can identify problems we should track and fix them.

When/if we pull this in I think we should add a paragraph in the readme asking for the user to report the problem that caused them to install the Reloader app.

From the wiki (doesn't apply entirely to this reloader app though but is part of the basis of my skepticism):

# For modifications to existing apps/modules:
[...]
- Avoid hacks to work around particular problems. If something is broken in some other part of Bangle.js then ideally we should raise a bug for that and fix it, rather than adding a hack to every app that wants to use that functionality.

https://github.com/espruino/BangleApps/wiki/App-Contribution#for-modifications-to-existing-appsmodules