[8622] Add own function to send AI_Reaction packet.

Signed-off-by: NoFantasy <nofantasy@nf.no>

src/game/SharedDefines.h

@@ -2368,8 +2368,8 @@ enum PetDiet
 enum AiReaction
 {
     AI_REACTION_UNK1    = 1,
-    AI_REACTION_AGGRO   = 2,
-    AI_REACTION_UNK3    = 3,
+    AI_REACTION_AGGRO   = 2,                                // trigger aggro sound to play, if defined in dbc
+    AI_REACTION_UNK3    = 3,                                // seen happen at polymorph, possible when AI not in control of self?
     AI_REACTION_UNK4    = 4
 };