Offline caching of the tile icons

[wealstarr]

Is your feature request related to a problem? Please describe.
One or other icons are always broken, website down, no internet etc. And when I manually set them, it takes ages for them to load. I don't even see them anymore as by the time they are fetched and loaded, I'm already on the website.

Describe the solution you'd like
Offline caching. Icons saved and retrieved locally.