send_filters refactor

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

damus/Util/TipCounter.swift

@@ -0,0 +1,25 @@
+//
+//  TipCounter.swift
+//  damus
+//
+//  Created by William Casarin on 2022-05-11.
+//
+
+import Foundation
+
+class TipCounter {
+    var tips: [String: Int64] = [:]
+    var user_tips: [String: Set<String>] = [:]
+    var our_tips: [String: NostrEvent] = [:]
+    var our_pubkey: String
+    
+    enum CountResult {
+        case already_tipped
+        case success(Int64)
+    }
+    
+    init (our_pubkey: String) {
+        self.our_pubkey = our_pubkey
+    }
+}
+