Shifter Faerun backgrounds have wrong benefits

[thoth-process]

Most of the Faerun - Shifter backgrounds from Dragon 394 list only standard type of background benefits, but many of them have unique benefits and give several benefits at once.

[thoth-process]

To elaborate: The easily-mechanical parts of the backgrounds are listed in the <rules> section, but that only gives each of those mechanical pieces as a selectable option, instead of granting the entire background benefit. So new Background Features need to be written for each of these, and the rules moved into those features instead.