Implement joining a room and sending updates after people join/leave

crates/rpc/proto/zed.proto

@@ -17,7 +17,8 @@ message Envelope {
         JoinRoomResponse join_room_response = 11;
         Call call = 12;
         IncomingCall incoming_call = 1000;
-        RespondToCall respond_to_call = 13;
+        CancelCall cancel_call = 1001;
+        DeclineCall decline_call = 13;
         RoomUpdated room_updated = 14;
 
         RegisterProject register_project = 15;
@@ -184,9 +185,10 @@ message IncomingCall {
     repeated uint64 participant_user_ids = 3;
 }
 
-message RespondToCall {
+message CancelCall {}
+
+message DeclineCall {
     uint64 room_id = 1;
-    bool accept = 2;
 }
 
 message RoomUpdated {

crates/rpc/src/proto.rs

@@ -84,12 +84,14 @@ messages!(
     (BufferReloaded, Foreground),
     (BufferSaved, Foreground),
     (Call, Foreground),
+    (CancelCall, Foreground),
     (ChannelMessageSent, Foreground),
     (CopyProjectEntry, Foreground),
     (CreateBufferForPeer, Foreground),
     (CreateProjectEntry, Foreground),
     (CreateRoom, Foreground),
     (CreateRoomResponse, Foreground),
+    (DeclineCall, Foreground),
     (DeleteProjectEntry, Foreground),
     (Error, Foreground),
     (Follow, Foreground),
@@ -186,6 +188,7 @@ request_messages!(
     (CopyProjectEntry, ProjectEntryResponse),
     (CreateProjectEntry, ProjectEntryResponse),
     (CreateRoom, CreateRoomResponse),
+    (DeclineCall, Ack),
     (DeleteProjectEntry, ProjectEntryResponse),
     (Follow, FollowResponse),
     (FormatBuffers, FormatBuffersResponse),