Core/Scripts: Some cleanup for boss_kirtonos_the_herald script
Update src/server/game/Achievements/AchievementMgr.cpp

Prevent achievement completion log spam.
db/commit: fix sql error
DB/SAI: Fix crash with quest "Thirst Unending"
Closes #8856
Core/Misc: Use ASSERT (custom, better macro) instead of the C macro assert()
Core/Player: Prevent a crash in CastedCreatureOrGO and add an assertion to KilledMonster