Ports from (https://github.com/TrinityCore/TrinityCore)

Core/Unit: don't clear low health aura states on death
Core/Gossip: Fix gossip bug on modify money
Core/Spells: Change the radius of PBAoEs following the feedback received on
Core/Player: update interaction checks, some info taken from client
Core/Spell: abort channeling if no valid targets are found after searching
Core/Creature: fix _DespawnAtEvade saving wrong respawn time
Core/Spell: fixed some problems with per caster aura states
Quickfix a bug introduced by 2f19d97 which prevented GTAoE from being cast.
Core/SmartAI: allow SMART_ACTION_SEND_GOSSIP_MENU to override default gossip
Core/Spell: in case of immunity, check all effects to choose correct procFlags, as none has technically hit
Fix evade issues when a spell hits the target just before evading.
Scripts/Command: implement .debug play music command
Partial revert, Unit::getAttackerForHelper() shouldn't return units that we aren't in combat with (victim can be such a unit for players/player pets, which can startattack from a distance without entering combat).
Fix an issue where CanSpawn would never get invoked on creatures without per-guid script.
Core/Players: fix null dereference crash

Source/Framework/Constants/AccountConst.cs

@@ -760,6 +760,7 @@ namespace Framework.Constants
         CommandGoOffset = 852,
         CommandReloadConversationTemplate = 853,
         CommandDebugConversation = 854,
+        CommandDebugPlayMusic = 855,
         CommandNpcSpawngroup = 856, // Reserved For DynamicSpawning
         CommandNpcDespawngroup = 857, // Reserved For DynamicSpawning
         CommandGobjectSpawngroup = 858, // Reserved For DynamicSpawning