TimerTask.java, added "Game almost over" when few players remaining

This is a fast implementation, not tested. However the players to consider "few" must be added to config.

Another possibility if not by config is to get put "minPlayers / 2".

(All config must be set by arena too instead of global)
Better inventory save system. Added scoreboard saving too.
Player save data improved. Now saving scoreboard too.
Added more player data.
Merge pull request #5 from NemesisMate/master

Better inventory save system.