Scala XML and javax.json models support

Features:

• Scala XML model support
• javax.json model support

Improvements:

• Core
  • [BREAKING] Effect interface was moved to com.github.simy4.xpath.spi package for better modularisation story. All existing extensions adopted this change.
  • [BREAKING] automatic module names were changed

Benchmark	(fixtureName)	(nsContext)	Mode	Cnt	Score	Error	Units
Gson	attr	null	thrpt	25	5233.597	± 355.359	ops/s
Gson	simple	null	thrpt	25	5255.770	± 92.656	ops/s
Gson	special	null	thrpt	25	22157.770	± 116.389	ops/s
Jackson	attr	null	thrpt	25	5164.415	± 81.184	ops/s
Jackson	simple	null	thrpt	25	5019.702	± 25.621	ops/s
Jackson	special	null	thrpt	25	21195.006	± 127.969	ops/s
javax.json	attr	null	thrpt	25	1331.293	± 38.271	ops/s
javax.json	simple	null	thrpt	25	1222.065	± 52.185	ops/s
javax.json	special	null	thrpt	25	5085.358	± 556.216	ops/s
Dom	simple	null	thrpt	25	9106.220	± 90.642	ops/s
Dom	ns-simple	null	thrpt	25	8859.301	± 75.393	ops/s
Dom	attr	null	thrpt	25	8548.221	± 31.201	ops/s
Dom	special	null	thrpt	25	26284.892	± 165.159	ops/s
Dom4j	simple	null	thrpt	25	8432.025	± 58.912	ops/s
Dom4j	ns-simple	null	thrpt	25	8119.961	± 65.498	ops/s
Dom4j	attr	null	thrpt	25	7659.065	± 68.158	ops/s
Dom4j	special	null	thrpt	25	24504.344	± 258.515	ops/s
Scala XML	simple	null	thrpt	25	2907.755	± 212.305	ops/s
Scala XML	ns-simple	null	thrpt	25	2752.993	± 236.196	ops/s
Scala XML	attr	null	thrpt	25	1503.442	± 47.480	ops/s
Scala XML	special	null	thrpt	25	15654.450	± 374.588	ops/s
Xom	simple	null	thrpt	25	8129.801	± 104.183	ops/s
Xom	ns-simple	null	thrpt	25	7829.133	± 53.716	ops/s
Xom	attr	null	thrpt	25	8410.957	± 48.852	ops/s
Xom	special	null	thrpt	25	23435.276	± 1764.062	ops/s