Custom filtering and header slots
Add pageLengthCols and searchCols attributes for the header control widths. These both default to 3.
Add the 'header' slot for adding custom elements between Page Length and Search.
Add the 'search' slot and filter-function prop to allow customer filtering by replacing the in-built search control and additional filter elements.
If the filter-function prop is defined, the inbuilt search input will not be displayed. 3e7e12b