Update /dayz/izurvive to keep coordinates up-to-date

[Decicus]

As of right now, this endpoint is relatively outdated. Regardless of that, I'd like to not have to update it manually.

I want to do the following changes:

• Use iZurvive's APIs to receive the current map and coordinates (https://api.izurvive.com/maps/current + https://maps.izurvive.com/maps/CH-Top/1.9.2/citycoords.json)
• Cache what map version for a period of time.
  • 24 hours should be good, with the option to manually update via an artisan command.
• Cache the "citycoords.json" locally for the same period of time.