Added Blocks and Frequent Rotation Updates

Simple blocks have been added and players can collide against blocks and
also shoot blocks. Blocks are currently Blue.

Players also perodically send their rotation information to the server.
before the rotation information was sent only when the player did an
action because there was no need to send rotation information before.
Now that players can collide against blocks the rotation is required for
collision so players send an empty action packet that only contains the
rotation.