I would've preferred to just go with 4-spaces for indent and no tabs,
but lao is a bit conservative about it. :^)
Still, this is a ton better than mixing different styles all over the
place, especially within the same file.
the game can still read old v1.1 replays, and currently writes in that
version by default, too. it should be defaulted to the new format when
the first gameplay change from v1.1 is made.
