Core/Spells: Fixed a crash with summoning Wild Mushrooms
Core/Units: Removed deprecated BuildMovementPacket method and updated MovementFlags2 enum
Core/PacketIO: Fixed instant logouts displaying logout box with timer
Core/Units: Fixed transport positions sent in movement packets (also fixes a crash if on vehicle)
Core/Units: Fixed spiky player movement

Closes #8792
Core/Units: Started work on updating movement (main goal: remove SendMovementFlagUpdate())
Merge branch '4.3.4' of https://github.com/TrinityCore/TrinityCore into 4.3.4