Merge improved mute functionality from Charlie

This merge adds a bunch of new features from charlie's work on the new
mutelist changes:

- Muted words

- Mute performance optimizations

- New mute list UI

I needed to make a few changes to fix the tests in this merge. Otherwise
it seems to work ok!

Thank to Charlie for getting all of this working after many rounds of
review!

* branch `mute` of https://github.com/damus-io/damus:
  mute: fix bug with duplicate Indefinite items in MuteDurationMenu
  mute: fix mute hashtag from search view if no existing mutelist
  mute: integrate new MutelistManager
  mute: adding MutelistManager.swift
  mute: add maybe_get_content function to NdbNote
  mute: fix bug where mutes can't be added without existing mutelist
  mute: fix issue with not being able to change mute duration
  mute: don't mutate string when adding hashtag
  mute: implement fast MuteItem decoder
  tags: add u64 decoding function
  mute: migrating muted_threads to new mute list
  mute: adding ability to mute hashtag from SearchView
  mute: updating UI to support new mute list
  mute: adding filtering support for MuteItem events
  mute: receiving New Mute List Type
  mute: migrate Lists.swift to use new MuteItem
  mute: add new UI views for new mute list
  mute: adding new structs/enums for new mute list

Changelog-Added: Add ability to mute words, add new mutelist interface (Charlie)

damus/Views/DirectMessagesView.swift

@@ -39,7 +39,7 @@ struct DirectMessagesView: View {
     
     func filter_dms(dms: [DirectMessageModel]) -> [DirectMessageModel] {
         return dms.filter({ dm in
-            return damus_state.settings.friend_filter.filter(contacts: damus_state.contacts, pubkey: dm.pubkey) && !damus_state.contacts.is_muted(dm.pubkey)
+            return damus_state.settings.friend_filter.filter(contacts: damus_state.contacts, pubkey: dm.pubkey) && !damus_state.mutelist_manager.is_muted(.user(dm.pubkey, nil))
         })
     }
     
@@ -55,7 +55,7 @@ struct DirectMessagesView: View {
     
     func MaybeEvent(_ model: DirectMessageModel) -> some View {
         Group {
-            if let ev = model.events.last {
+            if let ev = model.events.last(where: { should_show_event(state: damus_state, ev: $0, keypair: damus_state.keypair) }) {
                 EventView(damus: damus_state, event: ev, pubkey: model.pubkey, options: options)
                     .onTapGesture {
                         self.model.set_active_dm_model(model)