- renamed admin giftbox to "present" for distinction
- renamed associated texture files of present
- replaced owner meta for present with sender instead
- added protection check to inventory take of present
- disabled formspec for recipient of empty present
- added sender/receiver checks when digging giftbox
- made default infotext of giftbox configurable
- changed owner of giftbox to placer for simplicity
- set default receiver of giftbox during placement
- switched all prior references of owner to receiver
- added alias for original admin giftbox