[Scripts] Implement script support for quest 12644
Credit to @xfurry [3015]
[Scripts] Improve quest 12733
Credit to @xfurry [3016]
[Scripts] Implement script support for the Headless Horseman - Hallow's
end boss
Credit to @xfurry [3017]
[Scripts] Implement script support for quests 11476 and 12075
Credit to @xfurry [3019]
[Scripts] Fix potential typo
Credit to @xfurry [3020]