allow use of icons from web sources

It would be amazing if we could use MDI icons in Tasker similar to how they are used in home-automation platforms like Home Assistant.

All that needs to be done to choose a particular icon (a cat, for example) is define

icon: "mdi-cat"

and the cat icon is loaded.

It would be great if, instead of including a very limited subset, Tasker could download an icon from materialdesignicons.com on-demand and cache it locally for use. The number of available icons is staggering!