Server can be crashed with invalid movement packets

Movement packet handling does not properly check the finiteness of x,y,z,pitch,yaw. In particular setting yaw/pitch to infinity, leaving the server, and then rejoining a second time will cause the server to crash. This can be fixed by a simple finiteness check and kick circa line 195 of PlayerConnection: https://hub.spigotmc.org/stash/projects/SPIGOT/repos/craftbukkit/browse/nms-patches/PlayerConnection.patch#173