Ghastling Pacifies Ghasts

When the player has a ghastling near them, ghasts should not attack the player.

• Provides a way to more safely bridge or do construction in the nether without being too overpowered because the player still has to keep the ghastling alive and nearby.
• Requires at least one successful trip to the Nether without it, so the player, in a way, "earns" this capability.