Fix some issues with charset handling during connect

* hostname and file paths are places where libmysqlclient ultimately only passes the string to an OS library so we should use whatever charset the OS expects, not mysql
* Even though _makeRawMySQLConnectionWithEncoding:isMasterConnection: takes an explicit charset argument most of the conversion logic simply used whatever charset the existing connection currently has, which is not neccesarily the one the new connection should use
* Add some remarks about the charset handling with passwords and mysql_error()
* Charsets do not apply to sqlstate.

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