[patch] Small aura-related change

[Darkruler]

Laise, could you tell me if what i did to fix the compile errors i had after 10156 (due to customs) was right?

http://github.com/Darkrulerz/Core/commit/e483f9cfea5d4aed06339c368e11f1e51a8e6917

[xarly]

Arcane blast doesn't stack, each cast replace old buff instead stacking.

[xarly]

Also trinkets with "chance" Auras, doesn't works.

For example, Phylactery of the Nameless Lich (50360) before this patch worked very well. Since this patch I have not seen it working anymore.

Or staff Nibelung (49992), which has the chance of summon a Val'kyr with harmful spells, looks like the Val'kyr is on holidays