extract HomeModel from ContentView

huge refactor

Signed-off-by: William Casarin <jb55@jb55.com>

damus/Models/DamusState.swift

@@ -9,11 +9,19 @@ import Foundation
 
 struct DamusState {
     let pool: RelayPool
-    let pubkey: String
+    let keypair: Keypair
     let likes: EventCounter
     let boosts: EventCounter
     let contacts: Contacts
     let tips: TipCounter
     let image_cache: ImageCache
     let profiles: Profiles
+    
+    var pubkey: String {
+        return keypair.pubkey
+    }
+    
+    static var empty: DamusState {
+        return DamusState.init(pool: RelayPool(), keypair: Keypair(pubkey: "", privkey: ""), likes: EventCounter(our_pubkey: ""), boosts: EventCounter(our_pubkey: ""), contacts: Contacts(), tips: TipCounter(our_pubkey: ""), image_cache: ImageCache(), profiles: Profiles())
+    }
 }