hunter: display Beast Cleave on Multishot.

Fixes https://github.com/Adirelle/AdiButtonAuras/issues/76.
Tidied hunter spells (order and comments).
Warlock: updated Immolate, Incinerate, Conflagrate and Backdraft (including (Fire and Brimstone versions).

Fixes https://github.com/Adirelle/AdiButtonAuras/issues/75.