Top level deeplink handling (#1660)

* Handle link opening on the top most levels and prepare for percolating them throughout the app
* Add support for a custom app scheme
* Add specific AppRoute parsers.
* Integrate custom scheme in the AppRouteURLParser
* Switch to `element://call` and cleanup route parsing

ElementX/Sources/Services/Timeline/TimelineItems/RoomTimelineItemView.swift

@@ -30,10 +30,6 @@ struct RoomTimelineItemView: View {
             .onDisappear {
                 context.send(viewAction: .itemDisappeared(itemID: viewState.identifier))
             }
-            .environment(\.openURL, OpenURLAction { url in
-                context.send(viewAction: .linkClicked(url: url))
-                return .systemAction
-            })
     }
 
     @ViewBuilder private var timelineView: some View {