[Bug Fix] Fix for undefined MySQL library behavior. (#2834)

* MYSQL objects cannot be copied in a well defined way, this removes the copy and replaces it with another connection

* Change to share underlying pointers.

* Push up mutex changes

* Post rebase

* Formatting

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Co-authored-by: KimLS <KimLS@peqtgc.com>
Co-authored-by: Akkadius <akkadius1@gmail.com>

world/world_boot.h

@@ -15,6 +15,7 @@ public:
 	static void RegisterLoginservers();
 	static bool DatabaseLoadRoutines(int argc, char **argv);
 	static void CheckForPossibleConfigurationIssues();
+	static void Shutdown();
 };