Add permission checks to tab-completion.
Prepare for 2.8.5
Tab completion improvements

Including permission checks.
Show material names in wand remove material command completion.
Collapse and Toss will no longer drop blocks (thanks, Drkmaster83!)
Break max_power_multiplier up, allow a wider range of wand power effects (MIGRATION NOTE)
Separate out permission and indestructibility tests- weird behavior with bedrock, etc.
A few spell tweaks.
Fix indestructible permission check.
Add rewind spell.
Add admin wand.
Some updates to the recall spell, add "death" type and reliable tp-to-death-point.