Added instance property to searchUI interface
Added searchFieldsAbbreviation property to searchUI interface
Added "add-item", "show-items" and "hide" event listeners to searchUI interface https://code.balkan.app/org-chart-js/searchui-customization#JS
Added instance property to filterUI interface
Added element property to filterUI interface
Added "update", "add-item", "add-filter" and "show-items" event listeners to filterUI interface https://code.balkan.app/org-chart-js/filter-ui-customization#JS
