update protocol packet definitions: replace value receivers with pointer receivers in PacketID methods, expand FixedBitSet size from 8 to 256 bits, and remove outdated documentation files

pkg/protocol/packet/game/server/move_vehicle.go

@@ -9,7 +9,7 @@ type MoveVehicle struct {
 	OnGround   bool
 }
 
-func (MoveVehicle) PacketID() packetid.ServerboundPacketID {
+func (*MoveVehicle) PacketID() packetid.ServerboundPacketID {
 	return packetid.ServerboundMoveVehicle
 }