BlockData - add cloner

[ShaneBeee]

Description

This PR aims to add a cloner to BlockData.

I noticed an issue someone brought forward the other day, when using BlockData, the data is created at parse time.
If you manipulate the data in a command for instance, the original object is manipulated.

EX:
(this uses reflect, as that is what they were using in their for instance)

import:
	org.bukkit.block.structure.StructureRotation

command /test:
	trigger:
		set {_d} to oak_stairs[]

		send "Before: &a%{_d}%"

		{_d}.rotate(StructureRotation.CLOCKWISE_90)

		send "After: &b%{_d}%"

When running the command several times:

> test
[10:19:48 INFO]: Before: minecraft:oak_stairs[facing=north;half=bottom;shape=straight;waterlogged=false]
[10:19:48 INFO]: After: minecraft:oak_stairs[facing=east;half=bottom;shape=straight;waterlogged=false]
> test
[10:19:50 INFO]: Before: minecraft:oak_stairs[facing=east;half=bottom;shape=straight;waterlogged=false]
[10:19:50 INFO]: After: minecraft:oak_stairs[facing=south;half=bottom;shape=straight;waterlogged=false]
> test
[10:19:50 INFO]: Before: minecraft:oak_stairs[facing=south;half=bottom;shape=straight;waterlogged=false]
[10:19:50 INFO]: After: minecraft:oak_stairs[facing=west;half=bottom;shape=straight;waterlogged=false]
> test
[10:19:51 INFO]: Before: minecraft:oak_stairs[facing=west;half=bottom;shape=straight;waterlogged=false]
[10:19:51 INFO]: After: minecraft:oak_stairs[facing=north;half=bottom;shape=straight;waterlogged=false]
> test
[10:19:51 INFO]: Before: minecraft:oak_stairs[facing=north;half=bottom;shape=straight;waterlogged=false]
[10:19:51 INFO]: After: minecraft:oak_stairs[facing=east;half=bottom;shape=straight;waterlogged=false]

(take note on "facing")
As you can see, the original data is being modified.

Adding a cloner solves this problem.
After this PR:

> test
[10:22:39 INFO]: Before: minecraft:oak_stairs[facing=north;half=bottom;shape=straight;waterlogged=false]
[10:22:39 INFO]: After: minecraft:oak_stairs[facing=east;half=bottom;shape=straight;waterlogged=false]
> test
[10:22:39 INFO]: Before: minecraft:oak_stairs[facing=north;half=bottom;shape=straight;waterlogged=false]
[10:22:39 INFO]: After: minecraft:oak_stairs[facing=east;half=bottom;shape=straight;waterlogged=false]
> test
[10:22:40 INFO]: Before: minecraft:oak_stairs[facing=north;half=bottom;shape=straight;waterlogged=false]
[10:22:40 INFO]: After: minecraft:oak_stairs[facing=east;half=bottom;shape=straight;waterlogged=false]
> test
[10:22:40 INFO]: Before: minecraft:oak_stairs[facing=north;half=bottom;shape=straight;waterlogged=false]
[10:22:40 INFO]: After: minecraft:oak_stairs[facing=east;half=bottom;shape=straight;waterlogged=false]
> 

(that note that "shape" doesn't persist)

---

Target Minecraft Versions: any
Requirements: none
Related Issues: none

[Pikachu920]

added a test :D