enet wip
something enet something something
It werks. (TODO: remove hardcoded peer IDs and server address, lol)
something something enet something
whoops
Remove useless bloat.
Remove logging.
Remove huge useless comment in connection.cpp
Add channels support.
Merge remote-tracking branch 'origin/master' into enet

Conflicts:
	src/connection.cpp
	src/server.cpp
	src/test.cpp
Don't brutalize the CPU in server and connection threads.
Process one event at a time and remove sleep from server and connection.
Use bitsets for ABM required_neighbors.
Merge branch 'master' into enet
Optimize Environment::getPlayer
Merge branch 'master' into enet

Conflicts:
	src/game.cpp
Initial MsgPack support.
Convert TOSERVER_INIT to msgpack.
Convert TOSERVER_PLAYERPOS
Use MSGPACK_DEFINE_EXTERNAL instead of manual operator<< and operator>> definitions.