[REQUEST] Block Spectator Portal Entrance

[RillSoji]

Similar to blocking portal usage when a player is in creative mode I would like to see a block for spectator mode as well. This would be useful for SMP servers like mine that have SMP Spectate plugins.

Allowing spec players to pass through portals causes other issues from cheating their way back to spawn from other worlds to losing their entire inventory from accidently porting.