Add NBT Parsing for items

[me4502]

Add support for parsing NBT data in the item parser.

This is a precursor for "Tools v2".

Ideally we can also remove the existing NBT classes once we switch to adventure-nbt.

EngineHub/worldedit-adapters#23

[codecov]

Codecov Report

Merging #1611 (b7880c2) into master (476342a) will decrease coverage by 0.34%.
The diff coverage is 1.37%.

@@             Coverage Diff              @@
##             master    #1611      +/-   ##
============================================
- Coverage     11.80%   11.45%   -0.35%     
+ Complexity     1055     1002      -53     
============================================
  Files           801      804       +3     
  Lines         32703    32577     -126     
  Branches       3801     3738      -63     
============================================
- Hits           3860     3732     -128     
- Misses        28654    28667      +13     
+ Partials        189      178      -11     

Impacted Files	Coverage Δ	Complexity Δ
.../java/com/sk89q/worldedit/bukkit/BukkitPlayer.java	0.00% <0.00%> (ø)	0.00 <0.00> (ø)
...n/java/com/sk89q/worldedit/bukkit/BukkitWorld.java	12.13% <0.00%> (ø)	5.00 <0.00> (ø)
...9q/worldedit/bukkit/adapter/BukkitImplAdapter.java	0.00% <ø> (ø)	0.00 <0.00> (ø)
...va/com/sk89q/worldedit/blocks/MobSpawnerBlock.java	0.00% <ø> (ø)	0.00 <0.00> (ø)
...acy/java/com/sk89q/worldedit/blocks/SignBlock.java	0.00% <ø> (ø)	0.00 <0.00> (ø)
...cy/java/com/sk89q/worldedit/blocks/SkullBlock.java	0.00% <ø> (ø)	0.00 <0.00> (ø)
...ain/java/com/sk89q/jnbt/AdventureNBTConverter.java	0.00% <0.00%> (ø)	0.00 <0.00> (?)
...ore/src/main/java/com/sk89q/jnbt/ByteArrayTag.java	0.00% <0.00%> (-90.91%)	0.00 <0.00> (-4.00)
...dit-core/src/main/java/com/sk89q/jnbt/ByteTag.java	0.00% <0.00%> (-80.00%)	0.00 <0.00> (-2.00)
...c/main/java/com/sk89q/jnbt/CompoundTagBuilder.java	0.00% <0.00%> (ø)	0.00 <0.00> (ø)
... and 58 more

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