Refactoring Database Access in Marauroa

At the moment database access in marauroa is designed for a single thread application. While this does work most of the time in turn based games (yes, Stendhal is turned based internally), it prevents doing non time critical stuff in another thread. In Stendhal we have the problem that any update or delete operation to the gameEvents table that takes more than a couple of seconds kills the server.

Requirements

Hard Requirements

• multi thread support
• parallel transactions in different threads

Would be nice

• a package of small classes instead of huge JDBCDatabase / StendhalPlayerDatabase
• an small abstraction layer to support different databases beside mysql (small as in "not hibernate")
• no extra dependencies on new libraries