Multi-mine

Description
A block no longer breaks after a set time after a player begins breaking a block. Blocks now have what is essentially health. The player mines the block, dealing damage. The block will heal, but only after a few seconds of not taking damage. Because of this, if 2 players are mining a block, it will take damage from both players; therefore, the time it takes to break a block is determined by the combined mining of the involved players, rather than a single player.