mute: migrating muted_threads to new mute list

This patch depends on: Adding ability to mute hashtag from SearchView

This is the last patch for the new mute list feature

- Removing MutedThreadsManager
- Adding system to migrate existing muted threads to new mute list

Closes: https://github.com/damus-io/damus/issues/1718
Closes: https://github.com/damus-io/damus/issues/856
Lighting Address: fishcharlie@strike.me
Signed-off-by: Charlie Fish <contact@charlie.fish>
Reviewed-by: William Casarin <jb55@jb55.com>
Signed-off-by: William Casarin <jb55@jb55.com>

damus/Models/SearchModel.swift

@@ -28,7 +28,7 @@ class SearchModel: ObservableObject {
     
     func filter_muted()  {
         self.events.filter {
-            should_show_event(keypair: state.keypair, hellthreads: state.muted_threads, contacts: state.contacts, ev: $0)
+            should_show_event(contacts: state.contacts, ev: $0)
         }
         self.objectWillChange.send()
     }
@@ -57,7 +57,7 @@ class SearchModel: ObservableObject {
             return
         }
         
-        guard should_show_event(keypair: state.keypair, hellthreads: state.muted_threads, contacts: state.contacts, ev: ev) else {
+        guard should_show_event(contacts: state.contacts, ev: ev) else {
             return
         }