Basic features and accompanied tests are added.
We already support an ";"-separated list of paths
We already support multi-selection not only for integer array indices but also for associative arrays
Missing features that are crucial are:
	// TODO: support for "." inside property name: a['property.with.dots']
	// TODO: support for successive indexing: a['1st and']['2nd parameter']['in the row']
	// TODO: fix for indexing property immediately ending up in the result tree: {a}['property'] should not put 'property' in the result tree
	// TODO: correct support for array (integer) indexing
	// TODO: add support for logical filtering
	// TODO: add support for user defined logical filtering funcions