Working, but incomplete second test release

A lot has changed since the first pre-release. The only missing command right now is the edit command.
Stages and completed arenas are still not stored, so stages still don't work.
Records are basically finished, except there is no way to actually display records. Players will get a message if they beat their own, or everyone else's record for an arena.
Players are put into a kind of fly mode, where upwards flying is blocked, which majorly improves mobility horizontally.
Block hit detection is much better, though it kind of hits a bit earlier than one might expect. If the hit detection is done later, the small stun received when falling on a block kills all movement in the x and y directions.