Support for new placement system

[StallEF]

Eco\Server\Eco.Gameplay\Objects\WorldObjectManyBlock.cs

[Error] [Eco] System.ArgumentOutOfRangeException: Block type is not supported (Parameter 'Eco.Gameplay.Objects.WorldObjectManyBlock')
at Eco.Mods.WorldEdit.Model.WorldEditBlock.Create(Block block, Vector3i originalPosition, Vector3i offsetPosition)
at Eco.Mods.WorldEdit.Model.WorldEditBlock.Create(Block block, Vector3i originalPosition)
at Eco.Mods.WorldEdit.Commands.SetCommand.<>c__DisplayClass3_0.g__DoAction|0(Vector3i pos)
at Eco.Shared.Math.WorldRange.ForEachInc(Action`1 a)
at Eco.Mods.WorldEdit.Commands.SetCommand.Execute(WorldRange selection)
at Eco.Mods.WorldEdit.Commands.WorldEditCommand.Execute()
at Eco.Mods.WorldEdit.Commands.WorldEditCommand.Invoke(WorldRange selection)
at Eco.Mods.WorldEdit.Commands.WorldEditCommand.Invoke()
at Eco.Mods.WorldEdit.WorldEditCommands.Delete(User user)

[Error] [Eco] System.NullReferenceException: Object reference not set to an instance of an object.
at Eco.Mods.WorldEdit.Model.WorldEditWorldObjectBlockData.From(WorldObject worldObject)
at Eco.Mods.WorldEdit.Model.WorldEditBlock.Create(Block block, Vector3i originalPosition, Vector3i offsetPosition)
at Eco.Mods.WorldEdit.Model.WorldEditBlock.Create(Block block, Vector3i originalPosition)
at Eco.Mods.WorldEdit.Commands.SetCommand.<>c__DisplayClass3_0.g__DoAction|0(Vector3i pos)
at Eco.Shared.Math.WorldRange.ForEachInc(Action`1 a)
at Eco.Mods.WorldEdit.Commands.SetCommand.Execute(WorldRange selection)
at Eco.Mods.WorldEdit.Commands.WorldEditCommand.Execute()
at Eco.Mods.WorldEdit.Commands.WorldEditCommand.Invoke(WorldRange selection)
at Eco.Mods.WorldEdit.Commands.WorldEditCommand.Invoke()
at Eco.Mods.WorldEdit.WorldEditCommands.Set(User user, String pTypeName)