Core/Scripting: Update spirit of Olum to use db gossip.
Core/Scripting: Fix error in previous commit.
Core/Scripting: Fix Gossip option select for npc_spirit_of_olum
Core/Spells: Remove correct stack of Deadly Poison when using Envenom
Core/Scripting: Allow Headless Horseman to be attacked

Fix by digz6666.
Note: this script needs rewrite, any pull request doing it is welcome.
Closes #3568
DB/Gossip: Fix a previous commit.
DB/Misc: Fix some startup errors.
Scripts/Razorfen Kraul add script for quest 1221

Credits to @XFurry , he is original author.

Closes #8165
Closes #10152

Signed-off-by: Nay <dnpd.dd@gmail.com>
Scripts/Razorfen Kraul: Fix build and a possible crash
Scripts/Misc: Rename creatures with mob_ / mobs_ in npc_ Note: Have fun :P