Meld priorities as per Balance Discord

[Tawmy]

As a convenience feature, it would be great to have a method that takes a job and returns an array of melding priorities, as per Balance Discord.

AC:

• Enum of all existing jobs
• Enum of all existing meldable attributes
• Method takes one parameter, job enum
• Returns array of meldabla attributes enum
• Array is ordered, most to least important