Refactored selectors structure
Merge branch 'development' of https://github.com/Sitefinity/feather into SelectorsRefactoring

Conflicts:
	Telerik.Sitefinity.Frontend/client-components/selectors/common/sf-list-group-selection.html
	Telerik.Sitefinity.Frontend/client-components/selectors/common/sf-services.js
	Telerik.Sitefinity.Frontend/client-components/selectors/taxonomies/sf-hierarchical-taxon-selector.js