Refactor MessageID Mutex #602
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As client embeds both messageIds, and an RWMutex, anonymously it was not obvious if calling `c.RLock()` accessed the directly embedded mutex or the one in messageIds. Changing this simplifies future refactoring.
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Clienthas an anonymoussync.RWMutex. It also has an anonymousmessageIdswhich itself has an anonymoussync.RWMutex. This complicates refactoring because if you removeClient.RWMutexeverything appears to continue working but themutexinmessageIdsis being called (unexpected behaviour so better to make things clear).In addition a test was tidied up a bit.