Plumtree sync (#393)

* wip plumtree

* sync works

* fix logging

* ttl to 0

* fix send packet to one peer

* spec

* wip GCS instead of bloom

* remove bloom filter remainders

* clean

* prune old announcements

* remove announcements from sync after LEAVE

* sync after 1 second

* pruning

* track own announcement and prune messages without announcements

* fix pruning

* getGcsMaxFilterBytes default value 400 bytes

* parameters

app/src/main/java/com/bitchat/android/mesh/PeerManager.kt

@@ -262,6 +262,8 @@ class PeerManager {
         fingerprintManager.removePeer(peerID)
         
         if (notifyDelegate && removed != null) {
+            // Notify specific removal event then list update
+            try { delegate?.onPeerRemoved(peerID) } catch (_: Exception) {}
             notifyPeerListUpdate()
         }
     }
@@ -529,4 +531,5 @@ class PeerManager {
  */
 interface PeerManagerDelegate {
     fun onPeerListUpdated(peerIDs: List<String>)
+    fun onPeerRemoved(peerID: String)
 }