The players are initialized the same way for a start or a reload.

Also:
 - no more teleportation to the spawn if the game is not launched (to be able to continue a game if the serveur crash)
 - the default gamemode is adventure.
Bugfixes
 - fixed a bug about the lava considered as a safe TP spot
 - the initial TP to the spawn is back (if crash, launch the game without the players connected and then, no one will be TP to the spawn).
Fixed a but in the wall generator
Blocks next to a tree (but not part of a tree) was transformed into solid block instead of the other one.