HardcoreLife

Adds support for Hardcore mode.

When Hardcore=true and a player dies, HardcoreLife will now cancel the server's attempt to perma-kill the player (setting the gamemode to Spectator). This is handled by checking to see if the player is within the server's spawn radius, or within 2 blocks of their bed. Because of this, it's impossible to set your gamemode to Spectator while the server is set to Hardcore AND you are in one of these two locations. For more details, please see Issue #15.