Stub implementation of SendQuickChat

Proper API will follow later

src/Impostor.Api/Net/Inner/RpcCalls.cs

@@ -34,5 +34,6 @@
         SetTasks = 29,
         ClimbLadder = 31,
         UsePlatform = 32,
+        SendQuickChat = 33,
     }
 }

src/Impostor.Server/Net/Inner/Objects/InnerPlayerControl.cs

@@ -297,6 +297,17 @@ namespace Impostor.Server.Net.Inner.Objects
                     break;
                 }
 
+                case RpcCalls.SendQuickChat:
+                {
+                    if (!await ValidateOwnership(call, sender))
+                    {
+                        return false;
+                    }
+
+                    // TODO: deserialize and expose the result in an API
+                    break;
+                }
+
                 default:
                     return await base.HandleRpcAsync(sender, target, call, reader);
             }