Personal Bookmarks plugin (for all players)

Adds the following commands and abilities to the server:

@permissions(UserLevels.GUEST)
#everything works for all users

/bookmark <name>
#creates a personal bookmark of the planet (need to be on planet)

/goto <name>
#moves ship to the bookmarked planet (need to be on ship)

/remove <name>
#removes a bookmark (need to be on planet)