Previously, when two players attacked each other in quick succession, they would both recieve garbage.
This is because internet lag will cause both of them to send the garbage before they recieve it, so no cancellation occurs.
This is the same behavior Tetrio used to have.

I fixed this by storing sent attacks in a list, and attacks now also send the number of attacks their target has sent before them.
This allows me to keep track of which attacks have "crossed" each other, and cancel them out even after they have been sent.

This fix only applies to when 2 players are attacking each other, since in this case the behavior of garbage cancellation is very consistent. In cases where multiple players are attacking different players, the attacks will go past each other as before.