Option to teleport to player spawn on void falling

**Is your feature request related to a problem? Please describe.**
teleport-on-void-falling doesn't help a player who falls into the void in the End in most cases. (It also leaves them to fall forever even if disable-void-damage is false.)

**Describe the solution you'd like**
Add a setting that allows players to be sent to their spawn point when falling into the void. This would trigger if teleport-on-void-falling is disabled or unsuccessful.

**Describe alternatives you've considered**
Player could also be sent to the current region's spawn or teleport point, if exists.