Fixed MySQL storage to work with latest version of Quassel.
Fixed quasselcore to use MySQL's utf8mb4 character set (MySQL 5.5.3+ support only) in order to allow for storage of the full Unicode range, as opposed to only characters encoded as 3 or fewer bytes in UTF-8 (this notably prevented Emoji working, and resulted in messages being TRUNCATED - i.e. LOST DATA!! - at the position of the 4-byte UTF-8 character).
Fixed issue with previous commit (fixing 4-byte UTF-8 support) which would apparently have occurred when the code was run (at least, according to the abstractsqlstorage.h file).
Updated setup SQL files to use the `utf8mb4` character set (thus allowing the `utf8mb4` fix to work on new installations as well as existing ones which have been converted via an `ALTER TABLE` statement...)
Merge pull request #3 from aziraphale/pr/kode54/branch_mysql_support

MySQL `utf8mb4` support (high-end Unicode, e.g. emoji, support) (take 2!)