Pending Zaps

A fairly large change that replaces Zaps in the codebase with "Zapping"
which is a tagged union consisting of a resolved Zap and a Pending Zap.
These are both counted as Zaps everywhere in Damus, except pending zaps
can be cancelled (most of the time).

damus/Views/Zaps/ZapsView.swift

@@ -9,17 +9,20 @@ import SwiftUI
 
 struct ZapsView: View {
     let state: DamusState
-    @StateObject var model: ZapsModel
+    var model: ZapsModel
+    
+    @ObservedObject var zaps: ZapsDataModel
     
     init(state: DamusState, target: ZapTarget) {
         self.state = state
-        self._model = StateObject(wrappedValue: ZapsModel(state: state, target: target))
+        self.model = ZapsModel(state: state, target: target)
+        self._zaps = ObservedObject(wrappedValue: state.events.get_cache_data(target.id).zaps_model)
     }
     
     var body: some View {
         ScrollView {
             LazyVStack {
-                ForEach(model.zaps, id: \.event.id) { zap in
+                ForEach(zaps.zaps, id: \.request.id) { zap in
                     ZapEvent(damus: state, zap: zap)
                         .padding([.horizontal])
                 }