BETA: Datapack part for [L5235]:

	* No more Skill Tree XML files looking like CSV files.
	* Documentation updated.
	* Skill Id and level have been split to avoid useless parsing, and improve readability.
	* Now list of attributes are now placed as sub-elements of the current skill and not in comma-separated attributes.
	* The races are read from its text representation instead of the numeric Id, more user friendly!
	* Social classes are read from its text representation too, more user friendly!
	* All constraints are in the XSD file.
		* They are stricter now.