AttackBlockCallback

Callback for left-clicking ("attacking") a block. Is hooked in before the spectator check, so make sure to check for the player's game mode as well!

Upon return:

• SUCCESS cancels further processing and, on the client, sends a packet to the server.
• PASS falls back to further processing.
• FAIL cancels further processing and does not send a packet to the server.

ATTACK_BLOCK does not let you control the packet sending process yet.