Core/Spells: Remade trajectory target selection (#19048)

* Remade trajectory target selection
* Added possibility to apply conditions to trajectory spells
* Properly recalculate delay time if CMSG_UPDATE_PROJECTILE_POSITION is received

src/server/game/Handlers/SpellHandler.cpp

@@ -701,6 +701,9 @@ void WorldSession::HandleUpdateProjectilePosition(WorldPacket& recvPacket)
     pos.Relocate(x, y, z);
     spell->m_targets.ModDst(pos);
 
+    // we changed dest, recalculate flight time
+    spell->RecalculateDelayMomentForDst();
+
     WorldPacket data(SMSG_SET_PROJECTILE_POSITION, 21);
     data << uint64(casterGuid);
     data << uint8(castCount);