dtlaunch: postpone load icons not initially needed

[thyttan]

Draw the first screen, then load in the rest of the icons from storage.

[bobrippling]

Looks good - I guess we could also load the remaining ones on-demand, when that particular icon is needed, happy to merge this as-is though

[thyttan]

I guess it's better to do as little as possible with storage for the sake of its longevity. But other than that I kind of prefer to keep the changes as is - should be slightly snappier when switching pages I'd think.

[bobrippling]

Sounds good, thanks again!