- adopt optionsNG
- trim historical header
- tighten COMMENT

Approved by:	portmgr (miwi)
- Fix leftover /var/games/sokoban (only when it is blank
  and matches the default) and advise users to remove it
  otherwise.
- Trim header
- Add missed option to OPTIONS_DEFINE

Reported by:	olgeni
Reset maintainer:

(reason: 550 5.1.1 <v.sri.sai.ganesh@hp.com>:
Recipient address rejected: User unknown in virtual alias table)
ResidualVM provides engine for playing Grim Fandango,
Escape from Moneky Island, Myst 3.

WWW: http://residualvm.org/

PR:		ports/176959
Submitted by:	Alexander Yerenkow <yerenkow@gmail.com>