DB/Misc - Some missing gossip options and conditions.
Core/Player: GetRewSpellCast & GetRewSpell should not be cast by questgiver if effect type SPELL_EFFECT_LEARN_SPELL
DB/SAI: Fix an SAI error
DB/SAI: Fixed a few typo errors from EAI to SAI conversion.
DB/SAI: SAI error fix.
Scipts/HallsOfReflection: Fix reset during mob waves.

closes #10995
DB/SAI: Remove flee from Ymirjar Flesh Hunter & Ymirjar Necromancer
Core/Misc: Fix some static analysis issues

Fix some static analysis issues about missing NULL checks.
Pass safe Creature pointer instead of summoning a Creature, passing the GUID and retrieve the same Creature from GUID.
Core/Chat: Fix ChatFlood.MessageCount not being handled correctly

Fix Anti-flood chat system to always allow 1 more message than the count specified in the ChatFlood.MessageCount config parameter.