This update fixes a few bugs and makes some small improvements.

Change Log:

1) Add new permission tntrun.heads (default true) to use HeadsPlus in-game. This will allow HeadsPlus to be enabled on the server, but also available as a reward or VIP perk in TNTRun.

2) Make the block break sound configurable (default BLOCK_SAND_BREAK). Arena floors don't have to be sand, so any suitable sound can be used. The sound can also be disabled completely using:
3) The config option " special: fancyblockbreak" is now redundant, superceded by item 2) above. It will be removed from the default config next release.

4) A previous release removed flight from players (i.e. spectators who have flight enabled) too early at the end of the game, to prevent players inadvertently leaving the arena bounds. As a result players can sometimes fall through the arena floor during the end-phase of the game, before the arena has reset. So flight has been re-enabled, and players leaving the arena bounds at this time will be teleported back into the arena. The players original flight status (pre-joining the arena) is restored when the arena stops and the players are teleported out of the arena.

4) Some minor code improvements.