Consider removing SelectionTracker #72
Description
This was implemented when I didn't really understand what I was doing with SwiftUI and probably contains lots of bad practices.
It looks like even the latest implementation of SwiftUI doesn't support selection management in LazyHGrid and LazyVGrid so this kind of functionality might still be beneficial, but I'm sure it could be implemented in a far better way.
Isn't it surprising that SwiftUI doesn't yet have a fully featured collection view.