Jarod Luebbert

Suppress compiler warnings for NSLog string format

1

Suppresses warnings from mis-matched string formatters.

Fix retain cycle in Client

2

## Introduction 📟 `Client` kept a strong reference to `Conversations`, `PrivatePreferences`, and `XMTPDebugInformation`, all which kept a strong reference to `Client`. I also noticed that `XmtpApiClient` objects hang around because...