Use @StateObject instead of @ObservedObject to bind viewmodel to SwiftUI

[russhwolf]

Using @ObservedObject would lead to bugs if the view also had @State properties, because changing the state would reinstantiate the viewmodel. This came up recently on a project where we stopped getting updates after a state change because the viewmodel was being recreated without calling activate() again.

[TadeasKriz]

Since this is KaMPKit, it might be worth adding the following link above it as a comment for people to dive into it.

https://www.hackingwithswift.com/quick-start/swiftui/whats-the-difference-between-observedobject-state-and-environmentobject