Remove packet parsing logic out of PacketHandler

[0blu]

This MR will remove the old packet parsing logic out of PacketHandlers (manual using WorldPacket) and introduces new classes for each packet type.

Notable example

-        GetPlayer()->TeleportTo(mapId, positionX, positionY, positionZ, orientation);
+        GetPlayer()->TeleportTo(packet.location);

• Test build of all supported client builds

[ratkosrb]

Whats up with this new class SpellCastTargetsInfo, why do we need this?

[0blu]

Whats up with this new class SpellCastTargetsInfo, why do we need this?

The current SpellCastTargets is stateful, you need a reference the player.

Which we might not have in the future when parsing will be handled in a different thread.