Updated config and fixed config file generation

Largest release yet, with some functionality. A config file is created
that tells the user to use /pvp_restore to see information about the
plugin (not implemented yet).

The config file generation actually makes sense now, and uses a much
more robust approach to generation.

Finally, the player will keep XP if he dies from a player related death,
and lose xp if he dies from the environment or a mob.